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Q:

The information of brilliant colors in a thin soap film is a consequence of the phenomena of

A) Polarization and interference	B) Diffraction and dispersion
C) Multiple refraction and dispersion	D) Multiple reflection and interference

Answer & Explanation Answer: D) Multiple reflection and interference

Explanation:

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Q:

The working of the quartz crystal in the watch is based on the

A) Piezo - electric Effect	B) Edison Effect
C) Photoelectric Effect	D) Johnson Effect

Answer & Explanation Answer: A) Piezo - electric Effect

Explanation:

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Q:

Optical fiber works on the principle of

A) Scattering	B) interference
C) total internal reflection	D) refraction

Answer & Explanation Answer: C) total internal reflection

Explanation:

Optical_fiber_works_on_the_principle_of1556277954.jpg image

Optical fiber works on the principle of total internal reflection.

The Total Internal Reflection is the phenomenon in which the complete reflection of a light ray reaching an interface with a less dense medium when the angle of incidence exceeds the critical angle.

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Q:

Total internal reflection can take place when light travels from

A) Air to glass	B) Air to water
C) Water to glass	D) Diamond to glass

Answer & Explanation Answer: D) Diamond to glass

Explanation:

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Q:

The working principle of a washing machine is

A) reverse osmosis	B) diffusion
C) centrifugation	D) dialysis

Answer & Explanation Answer: C) centrifugation

Explanation:

The working principle of a washing machine is centrifugation.

The_working_principle_of_a_washing_machine_is1542349278.jpg image

Centrifugation is a separation process which uses the action of centrifugal force to promote accelerated settling of particles in a solid-liquid mixture.

The washing machine consists of centrifuge for this purpose. A centrifuge is a piece of equipment that puts an object in rotation around a fixed axis, applying a force perpendicular to the axis of spin that can be very strong.

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Q:

Ball bearings are used in cycles, scooters etc to

A) Increase the friction between the wheel and the axle	B) Reduce the friction between the wheel and the axle
C) Reduce the friction between ground and the whee	D) None of the above

Answer & Explanation Answer: B) Reduce the friction between the wheel and the axle

Explanation:

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Q:

The ratio of expenditure and savings is 3 : 2 . If the income increases by 15% and the savings increases by 6% , then by how much percent should his expenditure increases?

A) 25	B) 21
C) 12	D) 24

Answer & Explanation Answer: B) 21

Explanation:

Therefore x = 21%

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Filed Under: Alligation or Mixture

Q:

The average weight of boys in a class is 30 kg and the average weight of girls in the same class is 20kg. If the average weight of the whole class is 23.25 kg, what could be the possible strength of boys and girls respectively in the same class?

A) 14 and 16	B) 13 and 27
C) 17 and 27	D) None of these

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