KVPY Stream-SA (Class 11) Physics: Questions 130 - 133 of 242

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Question number: 130

» Electrostatics » Electric Potential

MCQ▾

Question

An electron with an initial speed of 5.5 × 106 ms-1 is brought to rest by an electric field. The mass and charge of an electron are 9 × 10-31 kg and 1.6 × 10-19 C, respectively. Identify the correct statement

Choices

Choice (4) Response

a.

The electron moves from a region of higher potential to lower potential through a potential difference of 22.4 μV.

b.

The electron moves from a region of lower potential to higher potential through a potential difference of 85.07 V.

c.

The electron moves from a region of higher potential to lower potential through a potential difference of 85.07 V

d.

The electron moves from a region of lower potential to higher potential through a potential difference of 22.4 μV.

Question number: 131

» Gravitation » Geo-Stationary Satellites

Appeared in Year: 2015

MCQ▾

Question

If the axis of rotation of the earth were extended into space then it would pass close to

Choices

Choice (4) Response

a.

The sun

b.

The pole star

c.

The moon

d.

The centre of mass of all the planets in the solar system

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.

K= U for two positions of the planet in the orbit

b.

K= U always

c.

K< U always

d.

K> U always

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