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Alternating Current MCQ Questions

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Alternating Current Questions and Answers

Alternating Current Quiz Question	Answer
Average power in the L–C–R circuit depends upon the	current, emf and phase difference
In Colpitt oscillator the feedback network consists of	two capacitors and an inductor
In a circuit, the current lags behind the voltage by a phase difference of π/ 2, the circuit will contains which of the following ?	Only L
A choke is preferred to a resistance for limiting current in AC circuit, because	choke is a good absorber of heat
In L-C-R circuit if resistance increases, quality factor	decreases finitely
In an L-C-R series AC circuit, the voltage across each of the components L, C and R is 50 V. The voltage across the L-C combination will be	zero
In an L-C-R circuit, capacitance is changed from C to 2C. For the resonant frequency to remain unchanged, the inductance should be changed from L to	L/2
In an AC circuit, the current lags behind the voltage by π/3. The components of the circuit are	R and L
An inductance 1 H is connected in series with an AC source of 220 V and 50 Hz. The inductive reactance (in ohm) is	100 π
The current voltage relation of diode is given by I = (e^l000V/T –mA, where the applied voltage V is in volt and the temperature T is in kelvin. If a student makes an error measuring ± 0.01 V while measuring the current of 5 mA at 300 K, what will be the error in the value of current in mA?	0.2 mA

Atoms And Nuclei MCQ Questions

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Atoms And Nuclei Questions and Answers

Atoms And Nuclei Quiz Question	Answer
For ionising an excited hydrogen atom, the energy required (in eV) will be	13.6
	72
Mass of the nucleons together in a heavy nucleus is	greater than mass of nucleus
Which one of the following statement is true, if half-life of a radioactive substance is I month?	7/8th part of the substance will disintegrate in 3 months
If λ is decay constant and N the number of radioactive nuclei of an element, then the decay rate (R) of that element is	λN
What is the maximum wavelength of light emitted in Lyman series by hydrogen atom?	122 nm
In a radioactive decay. The half - life of radioactive substance is T_1/2 = 69.3s. the decay constant is	0.01 s-1
The α-particle is the nucleus of an atom of	Hydrogen
Which of the following value is the correct order of nuclear density?	2 × 1017 kg/m3
The nucleus of an atom consists of	neutrons and protons

Communication System MCQ Questions

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Communication System Questions and Answers

Communication System Quiz Question	Answer
In ruby laser, the stimulated emission is due to transition from	metastable state to ground state
The hottest planet of solar system is	Venus
The distance of Venus from the sun is 0.72 AU. The orbital period of the Venus is	225 days
If a radio receiver amplifies all the signal frequencies equally well, it is said to have high	fidelity
The waves used for Line of Sight (LOS) communication are	space waves
Choose the electromagnetic radiation relevant to telecommunication	microwave
A laser beam is used for carrying out surgery because it	can be sharply focused
Which of the following is not the main characteristic of laser beam?	High divergence
The principle of laser action involves	All of the above
In a video signal for transmission of picture, what value of bandwidth is used in communication system?	4.2 MHz

Current Electricity I MCQ Questions

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Current Electricity I Questions and Answers

Current Electricity I Quiz Question	Answer
Which of the following has a negative temperature coefficient?	C
The reciprocal of resistance is	Conductance
The temperature coefficient of resistance of a wire is 0.00125 per °C. At 300 K, its resistance is 1 ohm. This resistance of the wire will be 2 ohm at.	1127 K
If a wire is stretched to make it 0.1% longer, its resistance will	increase by 0.2%
The resistance of a 10 m long wire is 10Ω . Its length is increased by 25% by stretching the wire uniformly. Then, the resistance of the wire will be	15.6 Ω
The masses of the three wires of copper are in the ratio 5 : 3: 1 and their lengths are in the ratio 1 : 3 : 5. The ratio of their electrical resistance is	1: 15: 125
The amount of charge Q passed in time t through a cross-section of a wire is Q = 5t² + 3t + 1. The value of current at time t = 5 s is	53 A
Resistance of a wire at 20°C is 20 Ω and at 500°C is 60Ω . At what temperature its resistance is 25 Ω ?	80°C
The resistance of a metal increases with increasing temperature because	the collisions of the conducting electrons with the lattice consisting of the ions of the metal increases
In the circuit shown in fig the heat produced in the 5 ohm resistor due to the current flowing through it is 10 calories per second.	2 calories /sec

Current Electricity Ii MCQ Questions

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Current Electricity Ii Questions and Answers

Current Electricity Ii Quiz Question	Answer
The temperature of cold junction of thermocouple is 0°C. If the neutral temperature is 270°C, then the inversion temperature is	540° C
A piece of copper and another of germanium are cooled from room temperature to 80° K. The resistance of	copper decreases and germanium increases
An electric heater rated 220 V and 550 W is connected to AC mains. The current drawn by it is	2.5 A
A heater of 220 V heats a volume of water in 5 min. The same heater when connected to 110 V heats the same volume of water in (min)	20
A heater coil cut into two equal parts and one part is connected with heater. Now, heat generated in heater will be	twice
A 10 Ω electric heater operates on a 110 V line. The rate at which heat is developed in watts is	1210 W
An AC generator of 220 V have internal resistance, r =10 Ω and external resistance, R =100 Ω. What is the power developed in the external circuit?	400 W
	2
The power dissipated across resistance R which is connected across a battery of potential V is P. If resistance is doubled, then the power becomes	1/2
A 30 V, 90 W lamp is to be operated on a 120 V DC line. For proper glow, a resistor of ....Ω should be connected in series with the lamp.	30

Dual Nature Of Radiation And Matter MCQ Questions

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Dual Nature Of Radiation And Matter Questions and Answers

Dual Nature Of Radiation And Matter Quiz Question	Answer
Photoelectric effect was first successfully explained by	Einstein
An X-ray has a wavelength of 0.010 Å. Its momentum is	6.626 × 10–22 kg-m/s
The shortest wavelength of X-rays emitted from an X-ray tube depends on the	Voltage applied to the tube
Momentum of a photon of wavelength λ is	h/λ
The wavelength of X-rays is of the order of	Angstrom (10–10m)
Cathode rays enter a magnetic field making oblique angle with the lines of magnetic induction. What will be the nature of the path followed?	Helix
The linear momentum of an electron, initially at rest, accelerated through a potential difference of 100 V is	5.4 × 10-24
The resistance of a discharge tube is	non-ohmic
What is the de-Broglie wavelength of the electron accelerated through a potential difference of 100 V?	1.227 Å
Find the de-Broglie wavelength for a 100 g bullet moving at 900 ms^-1.	7.4 ×10 -36 m

Electromagnetic Induction MCQ Questions

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Electromagnetic Induction Questions and Answers

Electromagnetic Induction Quiz Question	Answer
	The potential at O is zero
Lenz\'s law applies to	Electromagnetic induction
The number of turns in primary and secondary coils of a transformer is 50 and 200, respectively. If the current in the primary coil is 4 A, then the current in the secondary coil is	1 A
A transformer rated at 10 kW is used to connect a 5 kV transmission line to a 240 V circuit. The ratio of turns in the windings of the transformer is	20.8
A step-down transformer has 50 turns on secondary and 1000 turns on primary winding. If a transformer is connected to 220 V and 1 A AC source, what is output current of the transformer ?	20 A
A transformer works on the principle of	mutual induction
The core of a transformer is laminated to reduce	eddy current
For a large industrial city with much load variations, the DC generator should be	mixed wound
Induction furnace is based on the heating effect of	magnetic field
Turn ratio is 1.25. The step-up transformer operates at 230 V and current through secondary is 2 A. Then, current in primary is	50 A

Electromagnetic Waves MCQ Questions

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Electromagnetic Waves Questions and Answers

Electromagnetic Waves Quiz Question	Answer
Which of the following relations is correct ?
Which of the following shows greenhouse effect?	Infrared rays
Solar radiation is	transverse electromagnetic waves
What is order of energy of X-rays (E_X ), radio waves (E_R ) and microwaves (E_M )?	EX > EM > ER
During the propagation of electromagnetic waves in a medium,	electric energy density is equal to the magnetic energy density
A plane electromagnetic wave of frequency 20 MHz travels through a space along x-direction. If the electric field vector at a certain point in space is 6 Vm^-1, what is the magnetic field vector at that point?	2 × 10-8 T
The speed of electromagnetic waves in vacuum depends upon the source of radiation. It	is same for all of them
An electromagnetic wave has	electric and magnetic vectors perpendicular to each other
A point source of electromagnetic radiation has an average power output of 1500 W. The maximum value of electric field at a distance of 3 m from this source in Vm ^-1 is	500
The dielectric constant of air is 1.006. The speed of electromagnetic wave travelling in air is a × 10⁸ ms^-1, where, a is about	3

Electrostatics I MCQ Questions

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Electrostatics I Questions and Answers

Electrostatics I Quiz Question	Answer
The electric intensity outside a charged sphere of radius R at a distance r(r > R) is
The electric field created by a point charge falls with distance r from the point charge as	2)
A soap bubble is charged to a potential of 16 V. Its radius is then doubled. The potential of the bubble now will be	8 V
Electric potential at the centre of a charged hollow metal sphere is	same as that on the surface
Three charges 1µC, 2µC, 3µC are kept at vertices of an equilateral triangle of side 1 m. If they are brought nearer, so that they now form an equilateral triangle of side 0.5 m, then work done is	0.01 J
The voltage of clouds is 4 × 10⁶ V with respect to ground. In a lightning strike lasting 100 ins, a charge of 4C is delivered to the ground. The power of lightning strike is	160 MW
A hollow metal sphere of radius 5 cms is charged such that the potential on its surface is 10 volts. The potential at the centre of the sphere is	10 volts
Two point charges +q and –q are held fixed at (–d, o) and (d, o) respectively of a x-y coordinate system. Then	Electric field at all points on y-axis is along x-axis
Six charges of equal magnitude, 3 positive and 3 negative are to be placed on PQRSTU corners of a regular hexagon, such that field at the centre is double that of what it would have been if only one +ve charge is placed at R. Which of the following arrangement of charge is possible for P, Q, R, S, T and U respectively.	–, + , +, –, +, –
A Gaussian surface in the figure is shown by dotted line. The electric field on the surface will be	due to all

Electrostatics Ii MCQ Questions

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Electrostatics Ii Questions and Answers

Electrostatics Ii Quiz Question	Answer
The energy stored in a capacitor of capacitance C having a charge Q under a potential V is
The capacity of a spherical condenser is 1 μF. If the spacing between the two spheres is 1 mm, the radius of the outer sphere is	3 m
In a parallel plate capacitor, the capacity increases, if	area of the plate is increased
Capacity of a capacitor is 48 μF. When it is charged from 0.1 C to 0.5 C, change in the energy stored is	2500 J
The capacitance of an isolated conducting sphere of radius R is proportional to	R
A capacitor of capacity 10µF is charged to a potential of 400 V. When its both plates are connected by a conducting wire, then heat generated will be	0.8 J
If dielectric is inserted in charged capacitor (battery removed), then quantity that remains constant is	charge
A 500 µF capacitor is charged at a steady rate of 100 µCs ^-1. The potential difference across the capacitor will be 10 V after an interval of	50 s
A parallel plate air capacitor has a capacitance C. When it is half filled with a dielectric of dielectric constant 5, the percentage increase in the capacitance will be	66.6%
The work done in placing a charge of 8 × 10^-18 C on a condenser of capacity 100 µF is	32 × 10-32 J

Gravitation MCQ Questions

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Gravitation Questions and Answers

Gravitation Quiz Question	Answer
Venus looks brighter than other planets because	It is closer to the earth than other planets
The orbital speed of Jupiter is	Less than the orbital speed of earth
Correct form of gravitational law is
Which of the following statements about the gravitational constant is true?	It does not depend on the nature of the medium in which the bodies are kept
What happens to the acceleration due to gravity with the increase in altitude from the surface of the earth?	Decreases
A geo-stationary satellite orbits around the earth in a circular orbit of radius 36,000km. Then, the time period of a spy satellite orbiting a few hundred km above the earth's surface (R_earth = 6,400km) will approximately be	2 hr

At what depth below the surface of the earth, the value of g is the same as that at a height of 5 km?	10 km

Kinetic Theory Of Gases MCQ Questions

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Kinetic Theory Of Gases Questions and Answers

Kinetic Theory Of Gases Quiz Question	Answer
Kinetic theory of gases was put forward by	Maxwell
	2
Which one of the following is not an assumption of kinetic theory of gases?	All molecules have same speed
Two identical containers each of volume V₀ are joined by a small pipe. The containers contain identical gases at temperature T₀ and pressure P₀. One container is heated to temperature 2T₀ while maintaining the other at the same temperature. The common pressure of the gas is p and n is the number of moles of gas in container at temperature 2₀, then
	curve B
The volumes of containers A and B, connected by a tube and a closed valve are V and 4 V, respectively. Both the containers A and B have the same ideal gas at pressures (temperatures) 5.0 ×10⁵ Pa(300 K) and 1.0 ×10⁵Pa (400 K), respectively. The valve is opened to allow the pressure to equalise, but the temperature of each container is kept constant at its initial value. Find the common pressure in the containers.	2.0 × 105 Pa
Two non-reactive monoatomic ideal gases have their atomic masses in the ratio 2 : 3. The ratio of their partial pressure, when enclosed in a vessel kept at a constant temperature is 4 : 3. The ratio of their densities is	8 : 9
A perfect gas at 27°C is heated at constant pressure so as to double its volume. The increase in temperature of the gas will be	300°C
A real gas behaves like an ideal gas, if its	pressure is low and temperature is high
The temperature of a gas contained in a closed vessel of constant volume increases by 1°C when the pressure of the gas is increased by 1%. The initial temperature of the gas is	100 K

Laws Of Motion MCQ Questions

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Laws Of Motion Questions and Answers

Laws Of Motion Quiz Question	Answer
A ball of mass (m) 0.5 kg is attached to the end of a string having length (L) 0.5 m. The ball is rotated on a horizontal circular path about vertical axis. The maximum tension that the string can bear is 324 N. The maximum possible value of angular velocity of ball (in radian/s) is	36
	3 m
In the arrangement shown in the Fig, the ends P and Q of an unstretchable string move downwards with uniform speed U. Pulleys A and B are fixed. Mass M moves upwards with a speed	2)
A particle P is sliding down a frictionless hemispherical bowl. It passes the point A at t = 0. At this instant of time, the horizontal component of its velocity is v. A bead Q of the same mass as P is ejected from A at t = 0 along the horizontal string AB, with the speed v. Friction between the bead and the string may be neglected. Let t_P and t_Q be the respective times taken by P and Q to reach the point B. Then :
A wire, which passes through the hole in a small bead, is bent in the form of quarter of a circle. The wire is fixed vertically on ground as shown in the figure. The bead is released from near the top of the wire and it slides along the wire without friction. As the bead moves from A to B, the force it applies on the wire is	radially inwards initially and radially outwards later
	45o
A block of mass m is resting on a smooth horizontal surface. One end of a uniform rope of mass m/ 3 is fixed to the block, which is pulled in the horizontal direction by applying force F at the other end. The tension in the middle of the rope is
A string of negligible mass going over a clamped pulley of mass m supports a block of mass M as shown in the figure. The force on the pulley by the clamp is given by
A person is sitting in a lift accelerating upwards. Measured weight of person will be	more than actual weight
A mass of 10 kg is suspended from a spring balance. It is pulled aside by a horizontal string so that it makes an angle of 60° with the vertical. The new reading of the balance is	20 kg–wt

Magnetism And Matter MCQ Questions

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Magnetism And Matter Questions and Answers

Magnetism And Matter Quiz Question	Answer
Magnetic moment of bar magnet is M. The work done to turn the magnet by 90° of magnet in direction of magnetic field B will be	MB
The susceptibility of a magnetism at 300 K is 1.2 × 10^-5. The temperature at which the susceptibility increases to 1.8 × 10^-5 is	200 K
A susceptibility of a certain magnetic material is 400 . What is the class of the magnetic material ?	Ferromagnetic
The magnetic susceptibility is negative for	only diamagnetic materials
The magnetic susceptibility of a paramagnetic substance at –73° C is 0.0060, then its value at –173° C will be	0.0120
On applying an external magnetic field, to a ferromagnetic substance domains	align in the direction of magnetic field
A superconducting material is	diamagnetic
Which of the following is represented by the area enclosed by a hysteresis loop ( B–H curve ) ?	Heat energy lost per unit volume in the sample
Nickel shows ferromagnetic property at room temperature. If the temperature is increased beyond Curie temperature, then it will show	paramagnetism
The magnetic susceptibility of paramagnetic materials is	positive, but very high

Mechanical Properties Of Fluids MCQ Questions

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Mechanical Properties Of Fluids Questions and Answers

Mechanical Properties Of Fluids Quiz Question	Answer
Surface tension of water at 1.2 atmospheric pressure	Same 74 dynes/cm
A viscous fluid is flowing through a cylindrical tube. The velocity distribution of the fluid is best represented by the diagram
A boat carrying a number of large stones is floating in a water tank. What would happen to the water level, if a few stones are unloaded into water?	Falls
Two liquid drops have diameters of 1 cm and 1.5 cm. The ratio of excess of pressures inside them is	3 : 2
Water is filled in a container upto height 3m. A small hole of area ‘a’ is punched in the wall of the container at a height 52.5 cm from the bottom. The cross sectional area of the container is A. If a/A = 0.1 then v² is (where v is the velocity of water coming out of the hole)	50
Water rises in plant fibres due to	capillarity
A liquid does not wet the solid surface if the angle of contact is	greater than 90°
The meniscus of mercury in a capillary glass tube, is	convex
Angle of contact of a liquid with a solid depends on	orientation of the solid surface in liquid
For a liquid which is rising in a capillary, the angle of contact is	acute

Mechanical Properties Of Solids MCQ Questions

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Mechanical Properties Of Solids Questions and Answers

Mechanical Properties Of Solids Quiz Question	Answer
Which of the following relation is true?	( 1 + σ ) 2η = Y
Which of the following substances has the highest elasticity?	Steel
On stretching a wire, the elastic energy stored per unit volume is	Fl/2 AL
The following four wires are made of the same material. Which of these will have the largest extension when the same tension is applied ?	length = 50 cm , diameter = 0.5 mm
If Young's modulus of elasticity Y for a material is 1.5 times its rigidity coefficient η , the Poisson's ratio σ will be	2)
For a given material, the Young's modulus is 2.4 times that of rigidity modulus. Its Poisson's ratio is	0.2
The Poisson's ratio cannot have the value	0.7
A wire is stretched under a force. If the wire suddenly snaps, the temperature of the wire	increases
A large open tank has two holes in the wall. One is a square hole of side L at a depth y from the top and the other is a circular hole of radius R at a depth 4 y from the top. When the tank is completely filled with water, the quantities of water flowing out per second from both holes are the same. Then, R is equal to
The hollow shaft is ... than a solid shaft of same mass, material and length.	less stiff

Motion In A Plane MCQ Questions

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Motion In A Plane Questions and Answers

Motion In A Plane Quiz Question	Answer
If kinetic energy of the particle of mass m performing UCM in a circle of radius r is E. Find the acceleration of the particle
A pellet of mass 1 g is moving with an angular velocity of 1 rads ^-1 along a circle of radius 1 m, the centrifugal force is	100 dyne
	45°
A body moving along a circular path of radius R with velocity v, has centripetal acceleration a. If its velocity is made equal to 2v, then its centripetal acceleration is	4a
A body is just being revolved in a vertical circle of radius R with a uniform speed. The string breaks when the body is at the highest point. The horizontal distance covered by the body after the string breaks is	2R
A body is tied to one end of the string and whirled in a vertical circle, the physical quantity which remains constant is	total energy
A particle moves in a circular path with decreasing speed. Choose the correct statement.	Angular momentum remains constant
The time period of the second's hand of a watch is	1 min
A particle describes a horizontal circle in a conical funnel whose inner surface is smooth with speed of 0.5 ms ^-1. What is the height of the plane of circle from vertex of the funnel?	2.5 cm
A man can throw a stone to a maximum distance of 80 m. The maximum height to which it will rise in metre, is	20 m

Motion In A Straight Line MCQ Questions

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Motion In A Straight Line Questions and Answers

Motion In A Straight Line Quiz Question	Answer
	2)

Students I, II and III perform an experiment for measuring the acceleration due to gravity (g) using a simple pendulum. They use different lengths of the pendulum and /or record time for different number of oscillations. The observations are shown in the table. Least count for length = 0.1 cm Least count for time = 0.1 s	EI is minimum
A particle moves with constant acceleration along a straight line starting from rest. The percentage increase in its displacement during the 4th second compared to that in the 3rd is	40%
A car moving at speed 50 km/h one applying brake stops at a distance of 6m. If same car move with the velocity 100 km/h, what distance it cover after applying the brakes.	24 m
A vernier calipers has 1 mm marks on the main scale. It has 20 equal divisions on the Vernier scale which match with 16 main scale divisions. For this Vernier calipers, the least count is	0.2 mm
The density of a solid ball is to be determined in an experiment. The diameter of the ball is measured with a screw gauge, whose pitch is 0.5 mm and there are 50 divisions on the circular scale. The reading on the main scale is 2.5 mm and that on the circular scale is 20 divisions. If the measured mass of the ball has a relative error of 2 %, the relative percentage error in the density is	3.1 %
	Reducing the exposed surface area of the body (e.g. by curling up) allows humans to maintain the same body temperature while reducing the energy lost by radiation
	The amplitude of the maximum net emf induced due to both the loops is equal to the amplitude of maximum emf induced in the smaller loop alone
In 1.0 s, a particle goes from point A to point B, moving in a semicircle of radius 1.0 m (see Figure). The magnitude of the average velocity	2.0 m/s

Moving Charges And Magnetism MCQ Questions

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Moving Charges And Magnetism Questions and Answers

Moving Charges And Magnetism Quiz Question	Answer
If a current is passed in a spring, it	gets compressed
Toroid is	ring shaped closed solenoid
A straight conductor carrying current I. If the magnetic field at a distance r is 0.4 T, then magnetic field at a distance 2r will be	0.2 T
A current flows in a conductor from East to West. The direction of the magnetic field at a point above the conductor is	towards North
A wire oriented in the East-West direction carries a current eastward. Direction of the magnetic field at a point to the south of the wire is	vertically down
If in a circular coil A of radius R, current i is flowing and in another coil B of radius 2R a current 2i is flowing, then the ratio of the magnetic fields, B_A and B_B produced by them will be	1
Magnetic field	can accelerate a charge particle
A charged particle enters in a magnetic field whose direction is parallel to velocity of the particle, then the speed of this particle	in straight line
	2)
A solenoid has length 0.4 cm, radius 1 cm and 400 turns of wire. If a current of 5 A is passed through this solenoid, what is the magnetic field inside the solenoid?	6.28 × 10-3 T

Oscillations MCQ Questions

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Oscillations Questions and Answers

Oscillations Quiz Question	Answer
If a simple pendulum is taken to place where g decrease by 2%, then the time period	Increases by 1%
If a simple pendulum oscillates with an amplitude of 50 mm and time period of 2 s, then its maximum velocity is	0.15 ms-1
Ratio of kinetic energy at mean position to potential energy at A/2 of a particle performing SHM	4 : 1
Two particles executes SHM of same amplitude and frequency along the same straight line. They pass one another when going in opposite directions. Each time their displacement is half of their amplitude. The phase difference between them is	120°
The displacement of a particle in SHM various according to the relation x = 4 (cosπt + sinπt). The amplitude of the particle is	4√2
The circular motion of a particle with constant speed is	periodic but not simple harmonic
A particle is executing simple harmonic motion with an amplitude A and time period T. The displacement of the particle after 2T period from its initial position is	zero
Two particles A and B execute simple harmonic motion of period T and 5T/4. They start from mean position. The phase difference between them when the particle A complete an oscillation will be	π/2
	2)
A particle executes simple harmonic motion with a time period of 16 s. At time t = 2 s, the particle crosses the mean position while at t = 4 s, velocity is 4 ms^-1. The amplitude of motion in metre is

Ray Optics MCQ Questions

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Ray Optics Questions and Answers

Ray Optics Quiz Question	Answer
The apparent flattening of the sun at sunset and sunrise is due to	refraction
In Ramsden eyepiece, the two planoconvex lenses each of focal length f are separated by a distance 12 cm. The equivalent focal length (in cm) of the eyepiece is	13.5
A person uses spectacles of power + 2 D. He is suffering from	hypermetropia
For normal vision, what is distance of object from eye?	25 cm
An astronomical telescope has a large aperture to	increase span of observation
Which of the following relation is called minor equation?	1/v + 1/u = 1/f
Where should a person stand straight from the pole of a convex mirror of focal length 2.0 m on its axis, so that the image formed become half of his original height?	– 2.0 m
A ray of light is incident on a plane mirror at an angle of 60°. The angle of deviation produced by the mirror is	60°
A plane mirror produces a magnification of	+1
Two plane mirrors arc inclined at an angle θ. It is found that a ray incident on one mirror at any angle is rendered parallel to itself after reflection from both the mirrors. The value of θ is	90°

Semiconductor Devices MCQ Questions

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Semiconductor Devices Questions and Answers

Semiconductor Devices Quiz Question	Answer
In order to rectify an alternating current one uses a	diode
To obtain OR gate from NOR gate, you will need ____________	One NOR gate
In CE mode, the input characteristics of a transistor is the variation of	IB against VBE at constant VCE
In a transistor the collector current is always less than the emitter current because	a few electrons are lost in the base and only remaining ones reach the collector
When n-p-n transistor is used as an amplifier,	electrons move from emitter to base
The correct relation between α and β in a transistor is
When p-n junction is forward biased	both (and (2)
The phase difference between input and output voltages of a CE circuit is	180°
An oscillator is nothing but an amplifier with	Positive feed back
For a given plate-voltage, the plate current in a triode is maximum when the potential of	The grid is positive and plate is positive

Systems Of Particles And Rotational Motion MCQ Questions

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Systems Of Particles And Rotational Motion Questions and Answers

Systems Of Particles And Rotational Motion Quiz Question	Answer
If the external torque acting on a system τ = 0, then	α = 0
Angular momentum of the particle rotating with a central force is constant due to	Zero torque
The centre of mass of a body	may lie within, outside or on the surface of the body
The centre of mass of three particles of masses 1 kg, 2 kg and 3 kg is at (3, 3,with reference to a fixed coordinate system. Where should a fourth particle of mass 4 kg be placed, so that the centre of mass of the system of all particles shifts to a point (1, 1,?	(–2, –2, –2)
A system consists of 3 particles each of mass m located at points (1, 1), (2,and (3, 3). The coordinates of the centre of mass are	(2, 2)
	(5, –4, –2)
Two particles A and B initially at rest, move towards each other, under mutual force of attraction. At an instance when the speed of A is v and speed of B is 2v, the speed of centre of mass is	zero
Two point objects of mass 1.5 g and 2.5 g respectively are at a distance of 16 cm apart, the centre of gravity is at a distance x from the object of mass 1.5 g, where x is	10 cm
Identify the correct statement for the rotational motion of a rigid body.	The centre of mass of the body moves uniformly in a circular path.
Two point masses of 0.3 kg and 0.7 kg are fixed at the ends of a rod of length 1.4 m and of negligible mass. The rod is set rotating about an axis perpendicular to its length with a uniform angular speed. The point on the rod through which the axis should pass in order that the work required for rotation of the rod is minimum, is located at a distance of	0.98 m from mass of 0.3 kg

Thermal Properties Of Matter MCQ Questions

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Thermal Properties Of Matter Questions and Answers

Thermal Properties Of Matter Quiz Question	Answer
In which mode of transmission, the heat waves travel along straight line with the speed of light?	Thermal radiation
If mass energy equivalence is taken into account, when water is cooled to form ice, the mass of water should	increase
In a mercury thermometer, the ice point (lower fixed point) is marked as 10°C and the steam point (upper fixed point) is marked as 130° C At 40°C temperature, what will this thermometer read?	58°C
	12° C
The resistance of the wire in the platinum resistance thermometer at ice point is 5 Ω and at steam point is 5.25 Ω . When the thermometer is inserted in an unknown hot bath, its resistance is found to be 5.5 Ω . The temperature of the hot bath is	200° C
Mercury boils at 367°C. However, mercury thermometers are made such that they can measure temperature upto 500°C. This is done by	filling nitrogen gas at high pressure above the mercury column
On a hilly region, water boils at 95°C. The temperature expressed in Fahrenheit is	203°F
The readings of a constant volume gas thermometer at 0°C and 100°C are 40 cm and 60 cm of mercury respectively. If its reading at an unknown temperature is 100 cm of mercury column, then the temperature is	300° C
The temperature, at which Centigrade and Fahrenheit scales give the same reading, is	–40°
On Centigrade scale, the temperature of a body increases by 30°. The increase in temperature on Fahrenheit scale is	54°

Units And Measurements MCQ Questions

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Units And Measurements Questions and Answers

Units And Measurements Quiz Question	Answer
The unit of angular acceleration in the SI system is	rad s-2
The dimensions of gravitational constant G and the moment of inertia are, respectively	[M-1L3 T-2 ], [ML2 T0 ]
Range of weak nuclear force is ...............	10–18 km
If C be the capacitance and V be the electric potential, then the dimensional formula of CV² is	[ML2 T-2 A0 ]
If F denotes force and t time, then in equation F = at^-1 + bt² , the dimensions of a and b, respectively are	[MLT-1 ] and [MLT-4 ]
Strong nuclear force close not exist on ...............	electron
	current
Resistance of a given wire is obtained by measuring the current flowing in it and the voltage difference applied across it. If the percentage errors in the measurement of the current and the voltage difference are 3% each, then error in the value of resistance of the wire is	6%
	[M1/3L-1], [M2L-2T-2 ]
The percentage errors in the measurement of length and time period of a simple pendulum are 1% and 2% respectively. Then, the maximum error in the measurement of acceleration due to gravity is	5%

Vectors MCQ Questions

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Vectors Questions and Answers

Vectors Quiz Question	Answer

Which of the following is not a vector quantity?	Potential energy

A force is inclined at angle 60° to the horizontal. If its rectangular component in the horizontal direction is 50 N, then magnitude of the force in the vertical direction is	87 N
	45°

The coordinates of a particle moving in XY-plane at any instant of time t are x = 4t², y = 3t². The speed of the particle at that instant is	10 t
How many minimum number of coplanar vectors having different magnitudes can be added to give zero resultant?	3
The square of resultant of two equal forces is three times their product. Angle between the forces is
If A = B + C and have A, B and C scalar magnitudes of 5, 4 and 3 units respectively, then the angle between A and C is

Wave Optics MCQ Questions

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Wave Optics Questions and Answers

Wave Optics Quiz Question	Answer
A thin film of soap solution (n =1.lies on the top of a glass plate (n = 1.5). When visible light is incident almost normal to the plate, two adjacent reflection maxima are observed at two wavelengths 400 and 630 nm. The minimum thickness of the soap solution is	450 nm
Which phenomenon best supports the theory that matter has a wave nature?	Electron diffraction
Which one of the following phenomenon exhibits particle's nature of light ?	Photoelectric effect
Two coherent monochromatic beams of intensities I and 4I respectively are superposed. The maximum and minimum intensities in the resulting pattern are	9I and I
A Young's double slit set up for interference is shifted from air to within water, then the fringe width	decreases
Interference may be seen using two independent	lasers
A very thin film that reflects white light appears.	coloured
In Young's double slit experiment, the slit width and the distance of slits from the screen both are doubled. The fringe width	decreases
Resolving power of a telescope will be more, if the diameter a of the objective is	larger
An optically active compound	changing the direction of polarised light

Waves MCQ Questions

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Waves Questions and Answers

Waves Quiz Question	Answer
The function sin² (ω)t represents	A SHM with periodic time π/ω
A metallic wire of 1 m length has a mass of 10 × 10^-3 kg. If a tension of 100 N is applied to a wire, what is the speed of transverse wave?	100 ms-1
A wave represented by the equation y = a cos (kx - ωt) is superposed with another wave to form a stationary wave such that point x = 0 is a node. The equation for the other wave is	– a cos (kx + ωt)
Which quantity is transmitted with propagation of longitudinal waves through a medium?	Energy
A string of mass 3 kg is under tension of 400 N. The length of the stretched string is 25 cm. If the transverse jerk is stuck at one end of the string, how long does the disturbance take to reach the other end?	0.047 s
A sonometer wire of length 1.5 m is made of steel. The tension in it produces an elastic strain of 1%. What is the fundamental frequency of steel if density and elasticity of steel are 7.7 × 10³ kg / m³ and 2.2 × 10¹¹ N / m² respectively?	178.2 Hz
A string of density 7.5 g cm^-3 and area of cross-section 0.2 mm² is stretched under a tension of 20 N. When it is plucked at the mid-point, the speed of the transverse wave on the wire is	116 ms-1

When two waves of nearly equal frequencies v₁ and v₂ are produced simultaneously, the time interval between successive maxima is
Two Cu wires of radii R₁ and R₂, such that (R₁ > R₂ ). Then which of the following is true?	Transverse wave travels faster in thinner wire

Work Energy And Power MCQ Questions

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Work Energy And Power Questions and Answers

Work Energy And Power Quiz Question	Answer
For inelastic collision between two spherical rigid bodies	the linear momentum is conserved
A ball is dropped from height 20 m. If coefficient of restitution is 0.9, what will be the height attained after first bounce?	16.2 m
A piece of wire is bent in the shape of a parabola y = kx² (y-axis vertical) with a bead of mass m on it. The bead can slide on the wire without friction. It stays at the lowest point of the parabola when the wire is at rest. The wire is now accelerated parallel to the x-axis with a constant acceleration a. The distance of the new equilibrium position of the bead, where the bead can stay at rest with respect to the wire, from the y-axis is	2)
When a rubber band is stretched by a distance x, it exerts a restoring force of magnitude F = ax + bx², where a and b are constants. The work done in stretching the unstretched rubber band by L is
A block of mass 2 kg is free to move along the x-axis. It is at rest and from t = 0 onwards it is subjected to a time-dependent force F(t) in the x direction. The force F(t) varies with t as shown in the figure. The kinetic energy of the block after 4.5 seconds is	5.06 J
A spring stores 1 J of energy for a compression of 1 mm. The additional work to be done to compress it further by 1 mm is	3 J
Force of 50 N acting on a body at an angle θ with horizontal. If 150 J work is done by displacing it 3 m, then θ is	0°
	0
If W₁, W₂ and W₃ are the work done in moving a particle from A and B along three different paths 1, 2 and 3 respectively (as shown) in the gravitational field of a point mass M, the relation between W₁, W₂ and W₃ is	W1 = W2 = W3
A spring of force-constant k is cut into two pieces such that one piece is double the length of the other. Then the long piece will have a force-constant of	2)

Alternating Current MCQ Questions

Alternating Current Questions and Answers

Atoms And Nuclei MCQ Questions

Atoms And Nuclei Questions and Answers

Communication System MCQ Questions

Communication System Questions and Answers

Current Electricity I MCQ Questions

Current Electricity I Questions and Answers

Current Electricity Ii MCQ Questions

Current Electricity Ii Questions and Answers

Dual Nature Of Radiation And Matter MCQ Questions

Dual Nature Of Radiation And Matter Questions and Answers

Electromagnetic Induction MCQ Questions

Electromagnetic Induction Questions and Answers

Electromagnetic Waves MCQ Questions

Electromagnetic Waves Questions and Answers

Electrostatics I MCQ Questions

Electrostatics I Questions and Answers

Electrostatics Ii MCQ Questions

Electrostatics Ii Questions and Answers

Gravitation MCQ Questions

Gravitation Questions and Answers

Kinetic Theory Of Gases MCQ Questions

Kinetic Theory Of Gases Questions and Answers

Laws Of Motion MCQ Questions

Laws Of Motion Questions and Answers

Magnetism And Matter MCQ Questions

Magnetism And Matter Questions and Answers

Mechanical Properties Of Fluids MCQ Questions

Mechanical Properties Of Fluids Questions and Answers

Mechanical Properties Of Solids MCQ Questions

Mechanical Properties Of Solids Questions and Answers

Motion In A Plane MCQ Questions

Motion In A Plane Questions and Answers

Motion In A Straight Line MCQ Questions

Motion In A Straight Line Questions and Answers

Moving Charges And Magnetism MCQ Questions

Moving Charges And Magnetism Questions and Answers

Oscillations MCQ Questions

Oscillations Questions and Answers

Ray Optics MCQ Questions

Ray Optics Questions and Answers

Semiconductor Devices MCQ Questions

Semiconductor Devices Questions and Answers

Systems Of Particles And Rotational Motion MCQ Questions

Systems Of Particles And Rotational Motion Questions and Answers

Thermal Properties Of Matter MCQ Questions

Thermal Properties Of Matter Questions and Answers

Units And Measurements MCQ Questions

Units And Measurements Questions and Answers

Vectors MCQ Questions

Vectors Questions and Answers

Wave Optics MCQ Questions

Wave Optics Questions and Answers

Waves MCQ Questions

Waves Questions and Answers

Work Energy And Power MCQ Questions

Work Energy And Power Questions and Answers

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