JEE Questions for Physics Laws Of Motion Quiz 14

A body of mass M at rest explodes into three pieces, two of which of mass M/4 each are thrown off in perpendicular directions with velocities of 3 m/s and 4 m/s respectively. The third piece will be thrown off with a velocity of

0%
1.5 m/s
0%
2.0 m/s
0%
2.5 m/s
0%
3.0 m/s

Newton\'s second and third laws of motion lead to the conservation of

0%
Linear momentum
0%
Angular Momentum
0%
Potential energy
0%
Kinetic energy
0%
Force

A large force is acting on a body for a short time. The impulse imparted is equal to the change in

0%
Acceleration
0%
Momentum
0%
Energy
0%
Velocity
0%
Displacement

A diwali rocket is ejecting 0.05 kg of gases per second at a velocity of 400 m/sec. The accelerating force on the rocket is

0%
20 dynes
0%
20 N
0%
22 dynes
0%
1000 N

If force on a rocket having exhaust velocity of 300 m/sec is 210 N, then rate of combustion of the fuel is

0%
0.7 kg/s
0%
1.4 kg/s
0%
0.07 kg/s
0%
10.7 kg/s

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 Non the gun. How many bullets can he fire per second at the most?

0%
One
0%
Four
0%
Two
0%
Three

A gun of mass 10 kg fires 4 bullets per second. The mass of each bullet is 20 g and the velocity of the bullet when it leaves the gun is 300 ms^–1. The force required to holdthe gun while firing is

0%
6 N
0%
8 N
0%
24 N
0%
240 N

Which one of the following is not a force

0%
Impulse
0%
Tension
0%
Thrust
0%
Air resistance
0%
Weight

An object is kept on a smooth inclined plane of 1 in l. The horizontal acceleration to be imparted to the inclined plane so that the object is stationary relative to the inclined is

0%
0%
2)
0%
0%

An object is subjected to a force in the north-east direction. To balance this force, a second force should be applied in the direction

0%
North-East
0%
South
0%
South-West
0%
West

Two masses of 4 kg and 5 kg are connected by a string passing through a frictionless pulley and are kept on a frictionless table as shown in the figure. The acceleration of 5 kg mass is
Physics-Laws of Motion-77592.png

0%
49 m/s2
0%
5.44 m/s2
0%
19.5 m/s2
0%
2.72 m/s2

A block of mass M is attached to the lower end of a vertical spring. The spring is hung from a ceiling and has force constant value k. The mass is released from rest with the spring initially unstretched. The maximum extension produced in the length of the spring will be

0%
1 Mg/k
0%
2 Mg/k
0%
4 Mg/k
0%
Mg/2k

Two bodies of mass 3 kg and 4 kg are suspended at the ends of massless string passing over a frictionless pulley. The acceleration of the system is (g = 9.8 m/s²)

0%
4.9 m/s2
0%
2.45 m/s2
0%
1.4 m/s2
0%
9.5 m/s2

A block of mass m₁ rests on a horizontal table. A string tied to the block is passed on a frictionless pulley fixed at the end of the table and to the other end of string is hung another block of mass m₂. The acceleration of the system is

0%
0%
2)
0%
0%

A 2 kg blocks is lying on a smooth table which is connected by a body of mass 1 kg by a string which passes through a pulley. The 1 kg mass is hanging vertically. The acceleration of block and tension in the string will be

0%
3.27 m/s2, 6.54 N
0%
4.38 m/s2, 6.54 N
0%
3.27 m/s2, 9.86 N
0%
4.38 m/s2, 9.86 N

A light string passes over a frictionless pulley. To one of its ends a mass of 6 kg is attached. To its other end a mass of 10 kg is attached. The tension in the thread will be
Physics-Laws of Motion-77606.png

0%
24.5 N
0%
2.45 N
0%
79 N
0%
73.5 N

Two masses of 5 kg and 10 kg are connected to a pulley as shown in the figure. What will be the acceleration of the system (g = acceleration due to gravity)
Physics-Laws of Motion-77608.png

0%
g
0%
g/2
0%
g/3
0%
g/4

A body of weight 2 kg is suspended as shown in the figure. The tension T₁ in the horizontal string (in kg wt) is
Physics-Laws of Motion-77610.png

0%
0%
2)
0%
0%
2

A block of mass 4 kg is suspended through two light spring balances A and B. Then A and B will read respectively
Physics-Laws of Motion-77615.png

0%
4 kg and zero kg
0%
zero kg and 4 kg
0%
4 kg and 4 kg
0%
2 kg and 2 kg

Two block of masses 7 kg and 5 kg are placed in contact with each other on a smooth surface. If a force of 6 N is applied on the heavier mass, the force on the lighter mass is 7 kg
Physics-Laws of Motion-77616.png

0%
3.5 N
0%
2.5 N
0%
7 N
0%
5 N
0%
6 N

A block of mass \'m\' is connected to another block of mass `Al\' by a spring (massless) of spring constant \'k\'. The blocks are kept on a smooth horizontal plane. Initially the blocks are at rest and the spring is unstretched. Then a constant force \'F\' starts acting on the block of mass `M\' to pull it. Find the force on the block of mass \'m\'.

0%
0%
2)
0%
0%

Two bodies A and B of masses 10 kg and 15 kg respectively kept on a smooth, horizontal surface are tied to the ends of a light string. If T represents the tension in the string when a horizontal force F = 500 N is applied to A (as shown in figureand T\' be the tension when it is applied to B (figure 2), then which of the following is true?
Physics-Laws of Motion-77623.png

0%
0%
2)
0%
0%

A block of mass M placed on a frictionless horizontal table is pulled by another block of mass m hanging vertically by a massless string passing over a frictionlesspulley. The tension in the string is

0%
0%
2)
0%
0%

A vessel containing water is given a constant acceleration a towards the fight, along a straight horizontal path. Which of the following diagram represents the surface of the liquid
Physics-Laws of Motion-77634.png

0%
A
0%
B
0%
C
0%
D

A closed compartment containing gas is moving with some acceleration in horizontal direction. Neglect effect of gravity. Then the pressure in the compartment is

0%
Same everywhere
0%
Lower in front side
0%
Lower in rear side
0%
Lower in upper side

A ship of mass 3 × 10⁷ kg initially at rest is pulled by a force of 5 × 10⁴ N through a distance of 3 m. Assume that the resistance due to water is negligible, the speed of the ship is

0%
1.5 m/s
0%
60 m/s
0%
0.1 m/s
0%
5 m/s

If a street light of mass M is suspended from the end of a uniform rod of length L in different possible patterns as shown in figure, then
Physics-Laws of Motion-77641.png

0%
Pattern A is sturdier
0%
Pattern B is sturdier
0%
Pattern C is sturdier
0%
All will have same sturdiness

In the arrangement shown in figure the ends P and Q of an unstrechable string move downwards with uniform speed U. Pulleys A and B are fixed. Mass M moves upwards with a speed
Physics-Laws of Motion-77642.png

0%
0%
2)
0%
0%

A pulley fixed to the ceiling carries a string with blocks of mass m and 3m attached to its ends. The masses of string and pulley are negligible. When the system is released, its centre of mass moves with what acceleration

0%
0
0%
g/4
0%
g/2
0%
–g/2

0%
0%
29 N
0%
26 N
0%

A stick of 1 m is moving with velocity of 2.7 × 10⁸ ms^–1. What is the apparent length of the stick? (c = 3 × 10⁸ ms^–1)

0%
10 m
0%
0.22 m
0%
0.44 m
0%
2.4 m

A rope of mass 0.1 kg is connected at the same height of two opposite walls. It is allowed to hang under its own weight. At the contact point between the rope and the wall, the rope makes an angle θ=10° with respect to horizontal. The tension in the rope at its midpoint between the wall is

0%
2.78 N
0%
2.56 N
0%
2.82 N
0%
2.71 N

A block B is placed on block A. The mass of block B is less than the mass of block A. Friction exists between the blocks, whereas the ground on which the block A is placed is taken to be smooth. A horizontal force F, increasing linearly with time begins to act on B. The acceleration aA and aB of blocks A and B respectively are plotted against t. The correctly plotted graph is
Physics-Laws of Motion-77654.png

0%
0%
2)
0%
0%

In the figure given below, the position-time graph of a particle mass 0.1 kg is shown. The impulse t = 2 sec is
Physics-Laws of Motion-77660.png

0%
0.2 kg m sec–1
0%
– 0.2 kg m sec–1
0%
0.1 kg m sec–1
0%
– 0.4 kg m sec–1

The force-time (F – t) curve of a particle executing linear motion is an shown in the figure. The momentum acquired by the particle in time interval from zero to 8 seconds will be
Physics-Laws of Motion-77662.png

0%
–2 N-s
0%
+4 N-s
0%
6 N-s
0%
Zero

Figure shows the displacement of a particle going along the X-axis as a function of time. The force acting on the particle is zero in the region
Physics-Laws of Motion-77663.png

0%
AB
0%
BC
0%
CD
0%
DE

A body of 2 kg has an initial speed 5 ms^–1. A force actson it for some time in the direction of motion. The force time graph is shown in figure. The final speed of the body
Physics-Laws of Motion-77664.png

0%
9.25 ms–1
0%
5 ms–1
0%
14.25 ms–1
0%
4.25 ms–1

Which of the following graph depicts spring constant k versus length 1 of the spring correctly

0%
0%
2)
0%
0%

A particle of mass m moving with velocity u makes an elastic one dimensional collision with a stationary particle of mass m. They are in contact for a very short time T. Their force of interaction increases from zero to F₀ linearly in time T/2, and decreases linearly to zero in further time T/2. The magnitude of F₀ is
Physics-Laws of Motion-77671.png

0%
mu/T
0%
2 mu/T
0%
mu/2T
0%
None of these

A particle of mass m, initially at rest, is acted upon by a variable force F for a brief interval of time T. It begins to move with a velocity u after the force stops acting. F is shown in the graph as a function of time. The curve is a semicircle.
Physics-Laws of Motion-77673.png

0%
0%
2)
0%
0%

A body of mass 3 kg is acted on by a force which varies as shown in the graph below. The momentum acquired is given by
Physics-Laws of Motion-77679.png

0%
Zero
0%
5 N-s
0%
30 N-s
0%
50 N-s

The variation of momentum with time of one of the body in a two body collision is shown in fig. The instantaneous force is maximum corresponding to point
Physics-Laws of Motion-77681.png

0%
P
0%
Q
0%
R
0%
S

Figures I, II, III and IV depict variation of force with time
The impulse is highest in the case of situations depicted. Figure
Physics-Laws of Motion-77683.png

0%
I and II
0%
III and I
0%
III and IV
0%
IV only

A person used force (F), shown in figure to move a load with constant velocity on given surface
Identify the correct surface profile
Physics-Laws of Motion-77684.png

0%
0%
2)
0%
0%

In a gravitational force field a particle is taken from A to B along different paths as shown in figure. Then
Physics-Laws of Motion-77689.png

0%
Work done along path I will be maximum
0%
Work done along path II will be minimum
0%
Work done along path IV will be minimum
0%
Work done along all the paths will be the same

Assertion Inertia is the property by virtue of which the body is unable to change by itself the state of rest only.
Reason The bodies do not change their state unless acted upon by an unbalanced external force.

0%
If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
0%
If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
0%
If Assertion is true but Reason is false.
0%
If the Assertion and Reason both are false.
0%
If Assertion is false but Reason is true.

Assertion If the net external force on the body is zero, then its acceleration is zero.
Reason Acceleration does not depend on force.

0%
If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
0%
If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
0%
If Assertion is true but Reason is false.
0%
If the Assertion and Reason both are false.
0%
If Assertion is false but Reason is true.

Assertion A man in a closed cabin falling freely does not experience gravity.
Reason Inertial and gravitational mass have equivalence.

0%
If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
0%
If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
0%
If Assertion is true but Reason is false.
0%
If the Assertion and Reason both are false
0%
If Assertion is false but Reason is true.

Assertion Force is required to move a body uniformly along a circle.
Reason When the motion is uniform, acceleration is zero.

0%
If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
0%
If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
0%
If Assertion is true but Reason is false.
0%
If the Assertion and Reason both are false.
0%
If Assertion is false but Reason is true.

Assertion A body subjected to three concurrent forces cannot be in equilibrium.
Reason If large number of concurrent forces acting on the same point, then the point will be in equilibrium, if sum of all the forces is equal to zero.

0%
If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
0%
If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
0%
If Assertion is true but Reason is false.
0%
If the Assertion and Reason both are false.
0%
If Assertion is false but Reason is true.

JEE Questions for Physics Laws Of Motion Quiz 14 - MCQExams.com

0:0:1

Practice Physics Quiz Questions and Answers

JEE Questions for Physics Laws Of Motion Quiz 14 - MCQExams.com

0:0:1

Practice Physics Quiz Questions and Answers

Support mcqexams.com by disabling your adblocker.