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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:

Find the power of a convex lens if the image formed is at a distance of 10 cm from the lens when the object is placed on the other side of the lens at 40 cm from the optical centre?

A) 12.5 diopters B) 7.5 diopters
C) -12.5 diopters D) -7.5 diopters
 
Answer & Explanation Answer: A) 12.5 diopters

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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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0 1305
Q:

An image formed by a concave mirror on a screen is called __________?

A) Virtual image B) Real image
C) Inverted image D) Erect image
 
Answer & Explanation Answer: B) Real image

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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 1302
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:

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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1 1301
Q:

Sound is a form of ____________ which produces a sensation of hearing in our ears.

A) power B) energy
C) force D) momentum
 
Answer & Explanation Answer: B) energy

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