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Q:

Why is weightlessness experienced while orbiting the earth in space ships ?

A) Inertia B) Acceleration
C) Zero gravity D) Orbital motion
 
Answer & Explanation Answer: C) Zero gravity

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Q:

Terminal velocity ________.

A) first increases before decreasing B) is constant
C) first decreases before increasing D) always keeps on increasing
 
Answer & Explanation Answer: B) is constant

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Q:

Consider a hypothetical planet whose mass and radius are both half that of Earth. If g is the acceleration due to gravity on the surface of Earth, the acceleration due to gravity on the planet will be

A) g/4 B) g
C) 2g D) g/2
 
Answer & Explanation Answer: C) 2g

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Q:

Rectifiers convert _____.

A) high voltage to low voltage B) low voltage to high voltage
C) AC to DC D) DC to AC
 
Answer & Explanation Answer: C) AC to DC

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Q:

Addition of suitable impurities into semiconductor, is called

A) Doping B) Mixing
C) Forming D) Diluting
 
Answer & Explanation Answer: A) Doping

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Q:

What is the reason for formation of Mirage in desert?

A) Refraction of light B) Reflection of light
C) Total internal reflection of light D) Both Refraction and Total internal reflection of light
 
Answer & Explanation Answer: D) Both Refraction and Total internal reflection of light

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Q:

Find the kinetic energy (in J) possessed by a body of mass 10 kg moving with a velocity of 5 m/s.

A) 25 B) 125
C) 62.5 D) 50
 
Answer & Explanation Answer: B) 125

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Q:

While releasing the arrow from a stretched bow, the PE of the bow is converted into?

A) chemical energy B) kinetic energy
C) sound energy D) heat energy
 
Answer & Explanation Answer: B) kinetic energy

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