448
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:

_____ mirror is used in the headlights of cars.

 A) Semi-circular B) Conical C) Convex D) Concave

Explanation:

Filed Under: Physics
Exam Prep: Bank Exams

0 18
Q:

_______________ states that the ratio of the potential difference across a conductor to the current flowing through it, is a constant, provided that its physical conditions, such as temperature, remain constant.

 A) Lenz's Law B) Hooke's Law C) Ohm's Law D) The coulomb's law

Explanation:

Filed Under: Physics
Exam Prep: Bank Exams

0 17
Q:

Weight (W) of a body can be given by the formula

 A) W = mv B) W = mf C) W = ms D) W = mg

Explanation:

Filed Under: Physics
Exam Prep: Bank Exams

0 23
Q:

What is the value of acceleration due to gravity at the centre of earth?

 A) -1 B) 0 C) 1 D) Infinity

Explanation:

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Exam Prep: Bank Exams

0 39
Q:

________________ refers to the superposing of two or more coherent waves to produce regions of maxima and minima in space, according to the principle of superposition.

 A) Interference B) Rectification C) Intensity D) Diffraction

Explanation:

Filed Under: Physics
Exam Prep: Bank Exams

1 22
Q:

Motion of a train is an example of ______.

 A) Rotatory motion B) Spin motion C) Projectile motion D) Translatory motion

Explanation:

Filed Under: Physics
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0 40
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

Explanation:

Filed Under: Physics
Exam Prep: Bank Exams

0 55
Q:

Which of the following is a renewable source of energy?

 A) Coal B) Petroleum C) Plant D) Natural Gas