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 Physics Questions

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Q:

Which of the following cannot be used for making lenses?

A) Plastic B) Soil
C) Glass D) Water
 
Answer & Explanation Answer: B) Soil

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Q:

Calculate the frequency (in Hz) of a sound wave of wavelength 4m travelling with a speed of 200 m/s.

A) 50 B) 800
C) 100 D) 400
 
Answer & Explanation Answer: A) 50

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Q:

Farad is unit of ___________.

A) Capacitance B) Reactance
C) Electric charge D) Electric conductance
 
Answer & Explanation Answer: A) Capacitance

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Q:

Find the work done (in J) when a charge of 24 C moves across a potential difference of 6 V.

A) 4 B) 72
C) 8 D) 144
 
Answer & Explanation Answer: D) 144

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Q:

______________ of a wave is the rate of transfer of energy per unit area perpendicular to the direction of travel of the wave.

A) Interference B) Rectification
C) Intensity D) Diffraction
 
Answer & Explanation Answer: C) Intensity

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Q:

A permanent magnet can affect

A) Magnets B) Electromagnets
C) Both A & B D) None of the above
 
Answer & Explanation Answer: C) Both A & B

Explanation:

A permanent magnet can affect both magnets and electromagnets.

a_permanent_magnet_can_affect1559196137.jpg image

A permanent magnet has natural magnetic properties while a temporal magnet is created by artificial means. Permanent magnets do not lose their magnetic ability.

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1 1308
Q:

Which phenomenon is responsible for the echo of sound wave?

A) Reflection B) Refraction
C) Interference D) Polarisation
 
Answer & Explanation Answer: A) Reflection

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Q:

The shortest distance measured from the initial to the final position of an object is known as the _________________.

A) motion B) direction
C) velocity D) displacement
 
Answer & Explanation Answer: D) displacement

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