362
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:

Farad is unit of ___________.

A) Capacitance B) Reactance
C) Electric charge D) Electric conductance
 
Answer & Explanation Answer: A) Capacitance

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Q:

Instrument for measuring blueness of the sky or ocean is called ___________.

A) Bathymeter B) Ceraunograph
C) Cyanometer D) Barometer
 
Answer & Explanation Answer: C) Cyanometer

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Q:

If demand curve for alphonso mangoes is D = 25000 ­ 70P and supply curve is S = 10000 + 80P, find the equilibrium quantity?

A) 18,000 units B) 2,000 units
C) 1,800 units D) 200 units
 
Answer & Explanation Answer: A) 18,000 units

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Q:

The property of metal by which it can be drawn into wires is called _____________.

A) maleability B) viscosity
C) ductility D) tensile strength
 
Answer & Explanation Answer: C) ductility

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Q:

The force of friction between two surfaces will increase if:

A) a layer of lubricant is kept between the two surfaces B) the two surfaces are pressed harder
C) air gap is created between the two surfaces D) irregularities on both the surfaces are removed
 
Answer & Explanation Answer: B) the two surfaces are pressed harder

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Q:

Contact force is another name for _________.

A) Friction B) Magnetic force
C) Electrostatic force D) Muscular force
 
Answer & Explanation Answer: D) Muscular force

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Q:

Air moves from the region where the air _____________________________.

A) humidity is high to the region where the humidity is low B) pressure is low to the region where the pressure is high
C) pressure is high to the region where the pressure is low   D) humidity is low to the region where the humidity is high  
 
Answer & Explanation Answer: C) pressure is high to the region where the pressure is low  

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Q:

In _____________ motion of a body its velocity varies with time.

A) uniform B) linear
C) equilibrium D) non-uniform
 
Answer & Explanation Answer: D) non-uniform

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