KVPY (Kishore Vaigyanik Protsahan Yojana) Stream-SA (Class 11) Physics: Questions 132 - 135 of 253

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Question number: 132

» Laws of Motion » Force and Inertia

Appeared in Year: 2015

MCQ▾

Question

A parachutist with total weight 75 kg drops vertically onto a sandy ground with a speed of 2 ms–1 and comes to a halt over a distance of 0.25 m. The average force from the ground on her is close to

Choices

Choice (4) Response

a.

1200 N

b.

1350 N

c.

600 N

d.

1950 N

Question number: 133

» Gravitation » Energy

Appeared in Year: 2015

MCQ▾

Question

A planet is orbiting the sun is an elliptical orbit. Let U denote the potential energy and K denote the kinetic energy of the planet at an arbitrary point on the orbit. Choose the correct statement

Choices

Choice (4) Response

a.

for two positions of the planet in the orbit

b.

always

c.

always

d.

always

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

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