Laws of Motion Test

Result

Laws of Motion Test - 31

Score
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Weekly Quiz Competition

Question 1
4 / -1

Two bodies of equal masses revolve in circular orbits of radii R₁ and R₂ with the same period Their centripetal forces are in the ratio.

A

B

C

D

Solution
Question 2
4 / -1

Two masses M and M/2 are joined together by means of light inextensible string passed over a frictionless pulley as shown in fig. When the bigger mass is released, the small one will ascend with an acceleration

A

B

C

D

Solution
Question 3
4 / -1

A 0.5 kg ball moving with a speed of 12 ms^–1 strikes a hard wall at an angle of 30^o with the wall. It is reflected with the same speed and at the same angle. If the ball is in contact with the wall for 0.025 S the average force acting on the wall is

A
96 N

B
48 N

C
24 N

D
12 N

Solution
Question 4
4 / -1

A shell of mass 200g is ejected from a gun of mass 4 kg by an explosion that generates 1.05 KJ of energy. The initial velocity of the shell is

A
100 ms^–1

B
80 ms^–1

C
40 ms^–1

D
120 ms^–1

Solution
Question 5
4 / -1

A gramophone record is revolving with an anguler velocity ω. A coin is placed at a distance r from the centre of the record. The coefficient of static friction is . The coin will revolve with the record if

A

B

C

D

Solution
Question 6
4 / -1

A stone of mass 2 k g is tied to a string of length 0.5 m It the breaking tension of the string is 900N, then the maximum angular velocity the stone can have in uniform circular motion is

A
30 rad/s

B
20 rad/s

C
10 rad/s

D
25 rad/s

Solution
Question 7
4 / -1

A
240 N

B
150 N

C
220 N

D
192 N

Solution
Question 8
4 / -1

A sparrow flying in air sits on a stretched telegraph wire. If the weight of the sparrow is W ,which of the following is true about the tension T produced in the wire?

A
T = W

B
T < W

C
T = 0

D
T > W
Question 9
4 / -1

Fig. shows the displacement of a particle going along 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
None of these

Solution
Question 10
4 / -1

A Force (F) varies with time (t) as shown in fig. Average force over a complete cycle is-

A
Zero

B

C

D