313
Q:

# The working principle of a washing machine is

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

Explanation:

The working principle of a washing machine is centrifugation.

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.

Subject: Physics
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Q:

A kilowatt-hour is unit of

 A) Power B) Electric charge C) Energy D) Electric current

Explanation:

The kilowatt hour (kW⋅h) is a composite unit of energy equivalent to one kilowatt (1 kW) of power sustained for one hour.

One watt is equal to 1 J/s. One kilowatt hour is 3.6 megajoules.

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7 347
Q:

Which lenses should be used to correct the defect of astigmatism?

 A) Convex lens B) Bifocal lens C) Concave lens D) Cylindrical lens

Explanation:

Astigmatism is a common vision condition that causes blurred vision. It occurs when the cornea is irregularly shaped or sometimes because of the curvature of the lens inside the eye.

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5 326
Q:

Electrostatic precipitator is used to control

 A) Water pollution B) Noise pollution C) Air pollution D) Solid waste

Explanation:

Electrostatic precipitator is used to control Air pollution. An electrostatic precipitator is a filtration device that removes fine particles, like dust and smoke, from a flowing gas using the force of an induced electrostatic charge minimally impeding the flow of gases through the unit.

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3 169
Q:

Rate at which velocity changes over time?

 A) Speed B) Displacement C) Acceleration D) Jerk

Explanation:

Acceleration is nothing but the rate at which velocity changes over time.

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2 181
Q:

When a barometer is rising air pressure is

 A) increasing B) decreasing C) constant D) zero

Explanation:

The device which is used to measure air pressure is called as barometer. If the barometer reading is rising, it indicates that the air pressure is increasing and if the reading is falling the air pressure is decreaing.

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1 320
Q:

Acceleration is the rate of change of

 A) Speed B) Velocity C) Jerk D) Jounce

Explanation:

The rate of change of velocity is called as Acceleration.

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4 154
Q:

Radiocarbon dating technique is used to estimate the age of

 A) fossils B) rocks C) monuments D) soil

Explanation:

Radiocarbon dating also referred to as carbon dating or carbon-14 dating is a method for determining the age of an object containing organic material by using the properties of radiocarbon, a radioactive isotope of carbon.

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3 277
Q:

Carbon Arc lamps are commonly used in

 A) cinema projectors B) photography C) vehicles D) domestic lighting

Explanation:

The carbon arc lamp was the first widely-used type of electric light and the first commercially successful form of electric lamp.

Here are the Carbon Arc Lamp Uses :

-Super bright light, capable of lighting a large length of street or a large factory interior.

-Was the ONLY electric light available to light large areas from 1800 - 1901.

-Was cheaper to light streets with the arc lamp than gas or oil lamps.