JEE Questions for Physics Laws Of Motion Quiz 1

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
Physics-Laws of Motion-76355.png

0%
9
0%
18
0%
27
0%
36

0%
1 m
0%
2 m
0%
3 m
0%
6 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

0%
0%
2)
0%
0%

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 :
Physics-Laws of Motion-76365.png

0%
0%
2)
0%
0%

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

0%
always radially outwards
0%
always radially inwards
0%
radially outwards initially and radially inwards later
0%
radially inwards initially and radially outwards later

0%
0o
0%
30o
0%
45o
0%
60o

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

0%
0%
2)
0%
0%
0%

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

0%
0%
2)
0%
0%

A person is sitting in a lift accelerating upwards. Measured weight of person will be

0%
less than actual weight
0%
equal to actual weight
0%
more than actual weight
0%
None of the above

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

0%
20 kg–wt
0%
10 kg–wt
0%
0%

A body of mass 4 kg is accelerated up by a constant force, travels a distance of 5 m in the first second and a distance of 2 m in the third second. The force acting on the body is

0%
2 N
0%
4 N
0%
6 N
0%
8 N

An object of mass 5 kg is attached to the hook of a spring balance and the balance is suspended vertically from the roof of a lift. The reading on the spring balance when the lift is going up with an acceleration of 0.25 ms^-2 is take, (take, g = 10 ms^-2)

0%
51.25 N
0%
48.75 N
0%
52.75 N
0%
47.25 N
0%
55 N

What is the maximum value of the force F such that the block shown in the arrangement, does not move?
Physics-Laws of Motion-76391.png

0%
20N
0%
10N
0%
12N
0%
15N

0%
0%
g
0%
0%
zero

A man of weight mg is moving up in a rocket with acceleration 4g. The apparent weight of the man in the rocket is

0%
zero
0%
4 mg
0%
5 mg
0%
mg

A body of mass 8 kg is suspended through two light springs X and Y connected in series as shown in figure. The readings is X and Y respectively are
Physics-Laws of Motion-76398.png

0%
8 kg, zero
0%
zero, 8 kg
0%
6 kg, 2 kg
0%
8 kg, 8 kg

Three forces start acting simultaneously on a particle moving with velocity v .These forces are represented in magnitude and direction by the three sides of a triangle ABC (as shown). The particle will now move with velocity
Physics-Laws of Motion-76399.png

0%
less than v
0%
greater than v
0%
v in the direction of larger force BC
0%
v remaining unchanged

A block P of mass m is placed on a horizontal frictionless plane. A second block of same mass m is placed on it and is connected to a spring of spring constant k, the two blocks are pulled by distance A. Block Q oscillates without slipping. What is the maximum value of frictional force between the two blocks.
Physics-Laws of Motion-76401.png

0%
0%
2)
0%
0%
zero

Physical independence of force is a consequence of

0%
third law of motion
0%
second law of motion
0%
first law of motion
0%
All of the above

The string between blocks of mass m and 2m is massless and inextensible. The system is suspended by a massless spring as shown. If the string is cut find the magnitudes of accelerations of mass 2m and m (immediately after cutting)

0%
g, g
0%
2)
0%
0%

A man slides down on a telegraphic pole with an acceleration equal to one-fourth of acceleration due to gravity. The frictional force between man and pole is equal to in terms of man's weight w

0%
0%
2)
0%
0%
w

A body of mass 10 kg is acted upon by two forces each of magnitude 10 N making an angle of 60° with each other. Find the net acceleration of the body.

0%
0%
2)
0%
0%

System shown in figure is in equilibrium and at rest. The spring and string are massless, now the string is cut. The acceleration of mass 2m and m, just after the string is cut will be
Physics-Laws of Motion-76419.png

0%
g/2 upwards, g downwards
0%
g upwards, g/2 downwards
0%
g upwards, 2g downwards
0%
2g upwards, g downwards

A ball of mass 0.2 kg is thrown vertically upwards by applying a force by hand. If the hand moves 0.2 m while applying the force and the ball goes upto 2 m height further, find the magnitude of the force. (take, g =10 ms^-2.)

0%
4 N
0%
16 N
0%
20 N
0%
22 N

Two particles of mass m each are tied at the ends of a light string of length 2a. The whole system is kept on a frictionless horizontal surface with the string held tight so that each mass is at a distance 'a' from the centre P (as shown in the figure). Now, the mid-point of the string is pulled vertically upwards with a small but constant force F. As a result, the particles move towards each other on the surface. The magnitude of acceleration, when the separation between them becomes 2x, is

0%
0%
2)
0%
0%

0%
0°
0%
30°
0%
45°
0%
90°

For ordinary terrestrial experiments, the observer in an inertial frame in the following cases is

0%
a child revolving in a giant wheel
0%
a driver in a sports car moving with a constant high speed of 200 kmh-1 on a straight rod
0%
the pilot of an aeroplane which is taking off
0%
a cyclist negotiating a sharp curve

A student unable to answer a question on Newton's laws of motion attempts to pull himself up by tugging on his hair. He will not succeed

0%
as the force exerted is small
0%
the frictional force while gripping, is small
0%
Newton's law of inertia is not applicable to living beings
0%
as the internal force applied is to the system

Which of the following quantities measured from different inertial reference frames are same?

0%
Force
0%
Velocity
0%
Displacement
0%
Kinetic energy

An 80 kg person is parachuting and is experiencing a downward acceleration of 2.8 ms^-2. The mass of the parachute is 5 kg. The upward force on the open parachute is (take, g = 9.8 ms^-2)

0%
595 N
0%
675 N
0%
456 N
0%
925 N

A force of 1200 N acts on a 0.5 kg steel ball as a result of collision lasting 25 ms. If the force is in a direction opposite to the initial velocity of 14 ms^-1, then the final speed of the steel ball would be

0%
24 ms-1
0%
35 ms-1
0%
12 ms-1
0%
46 ms-1

0%
0%
2)
0%
0%

A lift is moving down with acceleration a. A man in the lift drops a ball inside the lift. The acceleration of the ball as observed by the man in the lift and a man standing stationary on the ground are respectively

0%
g , g
0%
g – a, g – a
0%
g – a, g
0%
a , g

A shell of mass 200 g is fired by a gun of mass 100 kg. If the muzzle speed of the shell is 80 m/s, calculate the recoil speed of the gun.

0%
16 cm/s
0%
8 m/s
0%
4 m/s
0%
16 m/s

A thorium nucleus emits an α-particle. Which of the following fundamental physics principles can be used to explain why the direction of the daughter nucleus recoil must be in the opposite direction of the α- emission?
I. Newton's third law
II. Conservation of momentum
III. Conservation of energy

0%
Only II
0%
Only III
0%
Both I and II
0%
Both II and III

A stationary bomb explodes into three pieces. One piece of 2 kg mass moves with a velocity of 8ms^-1 at right angles to the other piece of mass 1 kg moving with a velocity of 12 ms^-1 . If the mass of the third piece is 0.5 kg, then its velocity is

0%
10 ms-1
0%
20 ms-1
0%
30 ms-1
0%
40 ms-1
0%
50 ms-1

A cricket ball of mass 0.25 kg with speed 10 m/s collides with a bat and returns with same speed with in 0.01s. The force acted on bat is

0%
25 N
0%
50 N
0%
250 N
0%
500 N

If the resultant of all the external forces acting on a system of particles is zero, then from an inertial frame, one can surely say that

0%
linear momentum of the system does not change in time
0%
kinetic energy of the system does not change in time
0%
angular momentum of the system does not change in time
0%
potential energy of the system does not change in time

A hockey player receives a corner shot at a speed of 15 ms^-1 at an angle of 30° with the y – axis and then shoots the ball of mass 100 g along the negative x – axis with a speed of 30 ms^-1. If it remains in contact with the hockey stick for 0.01s, the force imparted to the ball in the x-direction is

0%
281.25 N
0%
187.5 N
0%
562.5 N
0%
375 N

A shell of mass 10 kg is moving with a velocity of 10 ms^-1 when it blasts and forms two parts of mass 9 kg and 1 kg respectively. If the 1st mass is stationary, the velocity of the 2nd is

0%
1 ms-1
0%
10 ms-1
0%
100 ms-1
0%
1000 ms-1

A rocket of mass 100 kg burns 0.1 kg of fuel per second. If velocity of exhaust gas is 1 kms^-1 , then it lifts with an acceleration of

0%
1000 ms-2
0%
100 ms-2
0%
10 ms-2
0%
1 ms-2

A bullet of mass 10 g moving with 300 ms^-1 hits a block of ice of mass 5 kg and drops dead. The velocity of ice is

0%
50 cm/s
0%
60 cm/s
0%
40 cm/s
0%
200 cm/s

A unidirectional force F varying with time t as shown in the figure acts on a body initially at rest for a short duration 2T. Then, the velocity acquired by the body is
Physics-Laws of Motion-76446.png

0%
0%
2)
0%
0%
zero

Two masses of M and 4M are moving with equal kinetic energy. The ratio of their linear momenta is

0%
1 : 4
0%
1 : 8
0%
1 : 2
0%
4 : 1

A truck is moving on a frictionless surface with uniform velocity of 10 ms^-1. A leak occurs in the water tank of the truck at the rate of 2 kgs^-1. What is the speed of truck after 50 s, if the mass of truck is 100 kg and mass of water in the truck initially was 100 kg?

0%
20 ms-1
0%
10 ms-1
0%
15 ms-1
0%
None of these

A player kicks a football of mass 0.5 kg and the football begins to move with a velocity of 10 m/s. If the contact between the leg and the football lasts for 1/50 s, then the force acted on the ball should be

0%
2500 N
0%
1250 N
0%
250 N
0%
625 N

A machine gun fires a bullet of mass 40 g with a velocity 1200 ms^-1. The man holding it can exert a maximum force of 144 N on the gun. How many bullets can be fired per second at the most?

0%
Only one
0%
Three
0%
Can fire any number of bullets
0%
144 × 48

At a certain instant of time, the mass of rocket going up vertically is 100 kg. If it is ejecting 5 kg of gas per second at a speed of 400 m/s, the acceleration of the rocket would be (take, g =10 m/s²)

0%
20 m/s2
0%
10 m/s2
0%
2 m/s2
0%
1 m/s2

A body of mass 1000 kg is moving horizontally with a velocity 50 ms^-1. A mass of 250 kg is added. Find the final velocity.

0%
40 ms-1
0%
23 ms-1
0%
12 ms-1
0%
32.5 ms-1

A gun fires bullets each of mass lg with velocity of 10 ms^-1 by exerting a constant force of 5 g weight. Then, the number of bullets fired per second is (take, g =10 ms^-2)

0%
50
0%
5
0%
10
0%
25

JEE Questions for Physics Laws Of Motion Quiz 1 - MCQExams.com

0:0:1

Practice Physics Quiz Questions and Answers

JEE Questions for Physics Laws Of Motion Quiz 1 - MCQExams.com

0:0:1

Practice Physics Quiz Questions and Answers

Support mcqexams.com by disabling your adblocker.