KVPY Stream-SA (Class 11) Physics: Questions 146 - 149 of 242

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Question number: 146

» Ray Optics » Lens Maker's Formula and Lens Formula

MCQ▾

Question

A point source of light is moving at a rate of 2 cm-s–1 towards a thin convex lens of focal length 10 cm along its optical axis. When the source is 15 cm away from the lens the image is moving at

Choices

Choice (4) Response
a.

8 cm-s–1 away from the lens

b.

4 cm-s–1 away from the lens

c.

4 cm-s–1 towards the lens

d.

8 cm-s–1 towards the lens

Question number: 147

» Thermodynamics » Concept of Temperature

MCQ▾

Question

An open mouthed bottle contains a gas at 500 C. To what temperature should the gas be heated so that half mass of the gas may leave it?

Choices

Choice (4) Response
a.

3730 C

b.

3800 C

c.

4440 C

d.

3500 C

Question number: 148

» Center of Mass » Centre of Mass of a Rigid Body

MCQ▾

Question

A hollow tilted cylindrical vessel of negligible mass rest is on a horizontal plane as shown. The diameter of the base is a and the side of the cylinder makes an angle θ with the horizontal. Water is then slowly poured into the cylinder. The cylinder topples over when the water reaches a certain height h, given by,

A hollow tilted cylindrical vessel

A Hollow Tilted Cylindrical Vessel

In figure a hollow tilted cylindrical vessel is shown. The diameter of the base is a and the side of the cylinder makes an angle θ with the horizontal.

Choices

Choice (4) Response
a.

h=atanθ

b.

h=2atanθ

c.

h=a2tanθ

d.

h=atan2θ

Question number: 149

» Properties of Solids & Liquids » Terminal Velocity

MCQ▾

Question

Two equal drops of rain falling in air with a constant velocity of 20 cm/sec. The drops mixed up and form a single drop, what would be their terminal velocity (in cm/sec)?

Choices

Choice (4) Response
a.

71.74

b.

15.87

c.

25.25

d.

31.74

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