Laws of Motion Test

Result

Laws of Motion Test - 79

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Question 1
4 / -1

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

A

B

C

D

Solution
Question 2
4 / -1

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

A
0.2 kg m sec^–1

B
– 0.2 kg m sec^–1

C
0.1 kg m sec^–1

D
– 0.4 kg m sec^–1

Solution
Question 3
4 / -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

A
–2 N-s

B
+4 N-s

C
6 N-s

D
Zero
Question 4
4 / -1

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

A
AB

B
BC

C
CD

D
DE
Question 5
4 / -1

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

A
9.25 ms^–1

B
5 ms^–1

C
14.25 ms^–1

D
4.25 ms^–1

Solution
Question 6
4 / -1

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

A

B

C

D

Solution
Question 7
4 / -1

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

A
mu/T

B
2 mu/T

C
mu/2T

D
None of these

Solution
Question 8
4 / -1

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.

A

B

C

D

Solution
Question 9
4 / -1

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

A
Zero

B
5 N-s

C
30 N-s

D
50 N-s

Solution
Question 10
4 / -1

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

A
P

B
Q

C
R

D
S

Solution