Physics-Work and Energy (NTSE Stage-2 (National-Level) Scholastic-Aptitude & Language Comprehension): Questions 1 - 3 of 5

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Question number: 1

» Physics » Work and Energy

Appeared in Year: 2013

MCQ▾

Question

A uranium nucleaus at rest decays into a thorium nucleus and a helium nucleus, as shown below. Which of the following is true?

 nucleaus at rest decays into a thorium

Nucleaus at Rest Decays Into a Thorium

nucleaus at rest decays into a thorium

Choices

Choice (4) Response

a.

The helium nucleus has more kinetic energy has more kinetic energy than the thorium nucleus.

b.

Each decay product has the same kinetic energy.

c.

The thorium nucleus has more momentum than the helium nucleus.

d.

The decay products tend to go in the same direction.

Question number: 2

» Physics » Work and Energy

Appeared in Year: 2013

MCQ▾

Question

A geo-stationary satellite is orbiting around earth at height of 30, 000 km in circular orbit. The radius of the earth is taken as 6000 km. The geo-stationary satellite comes back to its position after one revolution in exacity 24 h. Let the acceleration due to gravity (g) be 10 m/s 2 and mass of satellite be 1000 kg, calculate the work done in 12 h when moving under gravitational force.

Choices

Choice (4) Response

a.

0J

b.

3.6π×1014J

c.

2π×7.2π×1014J

d.

1.8π×1014J

Question number: 3

» Physics » Work and Energy

MCQ▾

Question

If a car covers 25th of the total distance with v1 speed and 35th distance with v2, then average speed is

Choices

Choice (4) Response

a.

5v1v23v1+2v2

b.

v1+v22

c.

2v1v2v1+v2

d.

12v1v2

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