KVPY Stream-SA (Class 11) Physics: Questions 150 - 153 of 252

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Question number: 150

» Work, Energy and Power » Power

MCQ▾

Question

A boy of weight 50 kg climbs up a staircase carrying 15 kg load on his head. The staircase has 35 steps and each step has a height of 15 cm. If he takes 20 seconds to climb, calculate the power developed by him. (g = 9.8 ms-2)

Choices

Choice (4) Response

a.

167.21

b.

323.3

c.

527.5

d.

95.32

Question number: 151

» Laws of Motion » Law of Conservation of Linear Momentum

MCQ▾

Question

A massless platform of hard paper is kept on a light elastic spring as figure shows. When a particle of mass 500 g is dropped on the platform from a height of 0.32 m, the particle strikes the platform and compresses the spring by 0.05 m. From what height the particle is dropped to get a compression of 0.08 m?

A platform attached on the spring

A Platform Attached on the Spring

In figure a platform of hard paper is attached on the spring. And a particle of mass 500 gm is dropped from height 0.32 m.

Choices

Choice (4) Response

a.

0.78

b.

0.68

c.

0.86

d.

0.70

Question number: 152

» Current Electricity » Electrical Energy and Power

MCQ▾

Question

In the following circuit, the 3 Ω resistor dissipates power Pi. If the resistor is replaced by 7 Ω, the power dissipated in it is Pf, then

 Circuit of combination of three different resistors

Circuit of Combination of Three Different Resistors

In figure circuit diagram of combination of three different resistors is shown.

Choices

Choice (4) Response

a.

Pf>Pi

b.

Pi>Pf

c.

Pi=Pf

d.

Question does not provide sufficient data or is vague

Question number: 153

» Current Electricity » Kirchhoff's Laws

MCQ▾

Question

Figure below shows a portion of an electric circuit with the currents in amperes and their directions. The magnitude and direction of the current in the portion AB is

A portion of an electric circuit indicated current

A Portion of an Electric Circuit Indicated Current

In figure a portion of an electric circuit indicated direction and magnitude of current.

Choices

Choice (4) Response

a.

1 A from A to B

b.

2A from B to A

c.

3 A from B to A

d.

0A

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