706
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:

What is the mass of a girl who weighs 450 N?

 A) 450 kg B) 4.5 kg C) 459 kg D) 45.9 kg

Explanation:

Filed Under: Physics
Exam Prep: Bank Exams

1 66
Q:

.......... never occurs singly in nature.

 A) Force B) Momentum C) Velocity D) Pressure

Explanation:

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Exam Prep: Bank Exams

0 76
Q:

Fill in the blank with the correct option.

A body is thrown vertically upwards. During its rise the Potential Energy .......... and Kinetic energy ..............

 A) decreases, decreases B) increases, decreases C) remains same, remains same D) decreases, increases

Explanation:

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Exam Prep: Bank Exams

0 40
Q:

Study the following figure carefully and answer the question that follows.

If the pivot is shifted 3 cm towards left, then what will be the moment of the couple at the new position?

 A) 80 Nm B) 10 Nm C) 0.8 Nm D) None

Explanation:

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0 56
Q:

A block of mass 10 kg accelerates uniformly from rest to a speed of 2 nits in 20 s. The average power developed in time interval of 0 to 20 seconds is :

 A) 1.5 W B) 0.5 W C) 2 W D) 1 W

Explanation:

Filed Under: Physics
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1 59
Q:

The work done by friction is not lost but is transferred as .......... energy.

 A) chemical B) frictional C) nuclear D) heat

Explanation:

Filed Under: Physics
Exam Prep: Bank Exams

1 32
Q:

Calculate the current drawn from a generator having a voltage output of 220 V when connected to a motor having a power of 1100 W.

 A) 5 A B) 50 A C) 10 A D) 100 A

Explanation:

Filed Under: Physics
Exam Prep: Bank Exams

1 36
Q:

What is the position of the image formed by a concave mirror when the object is placed at the centre of curvature of that spherical mirror?

 A) At Infinity B) Between Infinity and the centre of curvature C) At focus D) At the centre of curvature