313
Q:

The working principle of a washing machine is

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

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.

Subject: Physics
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Q:

A kilowatt-hour is unit of

A) Power B) Electric charge
C) Energy D) Electric current
 
Answer & Explanation Answer: C) Energy

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
 
Answer & Explanation Answer: 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
 
Answer & Explanation Answer: C) Air pollution

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.

                         Electrostatic_precipitator_is_used_to_control1564054124.png image

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3 169
Q:

Rate at which velocity changes over time?

A) Speed B) Displacement
C) Acceleration D) Jerk
 
Answer & Explanation Answer: C) Acceleration

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
 
Answer & Explanation Answer: A) increasing

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
 
Answer & Explanation Answer: B) Velocity

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
 
Answer & Explanation Answer: A) fossils

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
 
Answer & Explanation Answer: A) cinema projectors

Explanation:

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

carbon_arc_lamps_are_commonly_used_in1562825984.jpg image

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.

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