KVPY Stream-SA (Class 11) Physics: Questions 134 - 137 of 242

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Question number: 134

» Work, Energy and Power » Power

MCQ▾

Question

A 250 W motor drivers a pump which lifts 90 liters of water per minute to a height of 4 meters. The efficiency of the motor is nearly (take acceleration due to gravity to be 10 m/s2)

Choices

Choice (4) Response

a.

28 %

b.

26 %

c.

24 %

d.

22 %

Question number: 135

» Current Electricity » Ohm's Law

Appeared in Year: 2015

MCQ▾

Question

A light bulb of resistance R = 16 Ω is attached in series with an infinite resistor network with identical resistances r as shown below. A 10 V battery drives current in the circuit. What should be

A circuit diagram of light bulb and infinite resistor network

A Circuit Diagram of Light Bulb and Infinite Resistor Network

In circuit diagram a light bulb of resistance R = 16 Ω is attached in series with an infinite resistor network with identical resistances r. A 10 V battery drives current in the circuit.

the value of r such that the bulb dissipates about 1 W of power?

Choices

Choice (4) Response

a.

29.4 Ω

b.

3.7 Ω

c.

14.8 Ω

d.

7.4 Ω

Question number: 136

» Properties of Solids & Liquids » Latent Heat

MCQ▾

Question

An ice ball falls from a height h and melts completely. Assuming that only one-fifth of the heat generated is absorbed by the ice, calculate the value of h.

(Latent heat of fusion of ice = 3.4⨯105 JKg-1 and g = 10 Nkg-1)

Choices

Choice (4) Response

a.

160

b.

165

c.

170

d.

155

Question number: 137

» Thermodynamics » Concept of Temperature

Appeared in Year: 2015

MCQ▾

Question

One mole of ideal gas undergoes a linear process as shown in figure below. Its temperature expressed as function of volume V is

A linear process undergoes by idea gas

A Linear Process Undergoes by Idea Gas

In figure one mole of ideal gas undergoes a linear process is shown.

Choices

Choice (4) Response

a.

PoV0R(1(VV0)2)

b.

P0V0R

c.

P0VR(1VV0)

d.

P0VR

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