KVPY Stream-SA (Class 11) Physics: Questions 205 - 208 of 242

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Question number: 205

» Work, Energy and Power » Work-Energy Theorem

MCQ▾

Question

The displacement x of a particle moving in one dimension, under the action of a constant force is related to time t by the equation: t=2x+5

Where, x is in meter and t is sec. The work done by the force in first 7 sec is –

Choices

Choice (4) Response
a.

4 J

b.

2 J

c.

6 J

d.

0 J

Question number: 206

» Gravitation » Energy

MCQ▾

Question

Two starts each of 1 solar mass (2×1030kg) are approaching each other for a head-on collision. When they are at a distance of 109 km, their speeds are negligible. The speed with which they collide is –

(The radius of each star is 104 km, assume the stars to remain undistorted until they collide. G=6.67×1011N×m2kg2 . )

Choices

Choice (4) Response
a.

3.82×1016ms

b.

2.582×1012ms

c.

3.82×1012ms

d.

2.582×1016ms

Question number: 207

» Electrostatics » Capacitors

MCQ▾

Question

50 sheets of mica, each of thickness 0.1 mm are interspersed with aluminum foils of area 40 cm2. The metal sheets are connected alternately to form a system of capacitors. The capacitance of the capacitor is –

Choices

Choice (4) Response
a.

0.15μF

b.

0.1μF

c.

0.2μF

d.

0.25μF

Question number: 208

» Properties of Solids & Liquids » Heat Transfer » Convection

MCQ▾

Question

315 g of ice is mixed with 155 g of water at temperature 650C. The latent heat of ice is 80 cal/g and the specific heat of water is 1 cal/g-0C. Assuming no heat loss to the environment, the amount of ice which does not melt is:

Choices

Choice (4) Response
a.

0

b.

99.35 g

c.

115 g

d.

189 g

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