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Q:

What is the escape velocity of the rocket in the earth is?

A) 12.2 km/sec B) 10.2 km/sec
C) 13.2 km/sec D) 11.2 km/sec
 
Answer & Explanation Answer: D) 11.2 km/sec

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Q:

Speed of light is maximum in _____.

A) vacuum B) solids
C) liquids D) gases
 
Answer & Explanation Answer: A) vacuum

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Q:

Electric power is measured in units of

A) Volt B) Joule
C) Watt D) Ampere
 
Answer & Explanation Answer: C) Watt

Explanation:

Electric power is the rate per unit time, at which electrical energy is transferred by an electric circuit. The power of electricity is measured in watts and kilo watts.

1 Watt is the unit of electrical power equal to one ampere under the pressure of one volt.

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Q:

Weight of a person at a height of 2R from the centre of the earth, where R is the radius of the earth _______.

A) remains same B) becomes half
C) becomes twice D) becomes one­-fourth
 
Answer & Explanation Answer: D) becomes one­-fourth

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Q:

Why does a fountain pen leak in aeroplane flying at a height?

A) Because of reduced viscosity of the ink in the pen B) Because of increased viscosity of the ink in the pen
C) Because of higher atmospheric pressure outside the pen D) Because of lower atmospheric pressure outside the pen
 
Answer & Explanation Answer: D) Because of lower atmospheric pressure outside the pen

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Q:

Which of the following has the lowest frequency?

A) Visible light B) Gamma rays
C) X­-rays D) Ultra violet rays
 
Answer & Explanation Answer: A) Visible light

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Q:

The unit for measuring electric power is the

A) Steridian B) Watts
C) Watts D) Volts
 
Answer & Explanation Answer: C) Watts

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Q:

The energy associated with motion is called

A) Potential energy B) Kinetic energy
C) Both A & B D) Stored energy
 
Answer & Explanation Answer: B) Kinetic energy

Explanation:

Energy can be either potential or kinetic. The energy associated with motion is called Kinetic energy and similarly, the energy associated with position is called Potential energy.

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