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Q:

An air bubble in water will act like a

A) convex lens B) convex mirror
C) concave lens D) concave mirror
 
Answer & Explanation Answer: C) concave lens

Explanation:

An_air_bubble_in_water_will_act_like_a1557488532.jpg image

The lens which have atleast one inward curved surface is a concave lens. Concave ens is a diverging lens as it spreads out light rays that have been refracted through it.

A concave lens is thinner at its centre than at its edges.

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Q:

The speed of light will be minimum while passing through

A) water B) vaccum
C) air D) glass
 
Answer & Explanation Answer: D) glass

Explanation:
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Q:

In case of uniform circular motion, the acceleration is

A) Variable in magnitude but constant in direction B) Constant in magnitude and directed radially inwards
C) Variable in magnitude but tangential to the circle D) Zero
 
Answer & Explanation Answer: A) Variable in magnitude but constant in direction

Explanation:
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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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