591
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:

The product of mass of a body and the acceleration produced in it equals the ___________ acting on it.

 

A) force B) impulse
C) torque D) kinetic energy
 
Answer & Explanation Answer: A) force

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Q:

Velocity of a car does not depend on

A) Speedometer B) Change in direction
C) Change in speed D) Change in acceleration
 
Answer & Explanation Answer: A) Speedometer

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2 107
Q:

Echocardiogram is more closely related to

A) Doppler effect B) Zeeman effect
C) Photoelectric effect D) Magnetic effect
 
Answer & Explanation Answer: A) Doppler effect

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Q:

____ is not a type of heat transfer.

 

A) Diffusion B) Reflection
C) Convection D) Radiation
 
Answer & Explanation Answer: B) Reflection

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Q:

The gravitational force of attraction between two bodies is __________________ the product of their masses.

 

A) directly proportional to the square of B) inversely proportional to
C) inversely proportional to the square of   D) directly proportional to  
 
Answer & Explanation Answer: D) directly proportional to  

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Q:

Due to an acceleration of 1 m/s2 the velocity of a body increases from 15 m/s to 20 m/s in a certain period. Find the displacement (in m) of the body in that period.

 

A) 175 B) 625  
C) 87.5 D) 312.5
 
Answer & Explanation Answer: C) 87.5

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Q:

According to Rutherford the radius of the nucleus is about ______ than the radius of the atom.

 

A)  105 times greater B) 105 times lesser
C) 109 times greater D) 107 times greater
 
Answer & Explanation Answer: B) 105 times lesser

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Q:

A boy raises a box with a weight of 120N through a height of 2 m. The work done by him is

 

A) 60 J B) 120 J
C) 240 J D) 180 J
 
Answer & Explanation Answer: C) 240 J

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