Physics Test

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Physics Test - 9

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Question 1
1 / -0

The bending of light rays in the denser medium is termed as ________.

A

Dispersion

B

Reflection

C

Refraction

D

Deflection
Solution
The bending of light rays in the denser medium is termed as 'Refraction'.

Refraction: The bending of a ray of light when it goes from one medium to another is called refraction of light.
- Refraction occurs when waves or rays of the light bend towards or away from the normal when they travel from one medium to another of a different density.
- When a light ray travels from a lighter to a denser medium, the light ray bends towards the normal.
- When a light ray travels from a denser to a lighter medium the light ray bend away from the normal.
Question 2
1 / -0

A 0.1 kg mass is suspended from a wire of negligible mass. The length of the wire is 1m and its cross-sectional area is 4.9 × 10^-7 m^2. If the mass is pulled a little in the vertically downward direction and released, it performs simple harmonic motion of angular frequency 140 rad s^−1. If the Young’s modulus of the material of the wire is n × 10^9 Nm^-2, the value of n is

A

4

B

6

C

2

D

7
Question 3
1 / -0

A wooden block performs SHM on a frictionless surface with frequency, ν0. The block carries a charge +Q on its surface. If now a uniform electric field E is switched-on as shown, then the SHM of the block will be

A

of changed frequency and with the same mean position.

B

of the same frequency and with the same mean position

C

of changed frequency and with shifted mean position.

D

of the same frequency and with shifted mean position.
Question 4
1 / -0

A block of mass 0.18 kg is attached to a spring of force-constant 2 N/m. The coefficient of friction between the block and the floor is 0.1. Initially the block is at rest and the spring is un-stretched. An impulse is given to the block as shown in the figure. The block slides a distance of 0.06 m and comes to rest for the first time. The initial velocity of the block in m/s isV = N/10. Then N is

A

5

B

3

C

4

D

2
Question 5
1 / -0

A 2 µF capacitor is charged as shown in the figure. The percentage of its stored energy dissipated after the switch S is turned to position 2 is

A

80 %

B

20 %

C

75 %

D

0 %
Question 6
1 / -0

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

A

9

B

18

C

27

D

36
Question 7
1 / -0

A boy is pushing a ring of mass 2 kg and radius 0.5 m with a stick as shown in the figure. The stick applies a force of 2N on the ring and rolls it without slipping with an acceleration of 0.3 m/s^2. The coefficient of friction between the ground and the ring is large enough that rollingalways occurs and the coefficeint of friction between the stick and the ring is (P/10). The value of P is

A

4

B

3

C

5

D

6
Question 8
1 / -0

Consider a thin square sheet of side L and thickness t, made of a material of resistivity ρ. The resistance between two opposite faces, shown by the shaded areas in the figure is

A

directly proportional to L

B

independent of L

C

directly proportional to t

D

independent of t
Question 9
1 / -0

A ball of mass 0.2 kg rests on a vertical post of height 5 m. A bullet of mass 0.01 kg, traveling with a velocity V m/s in a horizontal direction, hits the centre of the ball. After the collision, the ball and bullet travel independently. The ball hits the ground at a distance of 20 m and the bullet at a distance of 100 m from the foot of the post. The velocity V of the bullet is

A

250√2 m/s

B

400 m/s

C

250 m/s

D

500 m/s
Question 10
1 / -0

Steel wire of lenght ‘L’ at 40°C is suspended from the ceiling and then a mass ‘m’ is hung from its free end. The wire is cooled down from 40°C to 30°C to regain its original length ‘L’. The coefficient of linear thermal expansion of the steel is 10^−5/°C, Young’s modulus of steel is 10^11 N/m^2 and radius of the wire is 1 mm. Assume that L ≫ diameter of the wire. Then the value of ‘m’ in kg is nearly

A

3

B

4

C

5

D

2