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Q:

A Shopkeeper charges sales tax of x% upto Rs.2,000 and above it he charges y%. A customer pays total tax of Rs 320, when he purchases the goods worth Rs. 6,000 and he pay's the total tax of Rs. 680 for the goods worth Rs. 12,000. The value of (x-y) is:

A) 0	B) -2
C) -4	D) 5

Answer & Explanation Answer: B) -2

Explanation:

$2000 x \frac{X}{100} + 4000 x \frac{Y}{100} = 320$

and $2000 x \frac{X}{100} + 10000 x \frac{Y}{100} = 680$

x = 4 and y = 6

x-y = -2

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Q:

A projectile launched at____ degree angle has the greatest range?

Answer

45

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Subject: Physics

Q:

Which is the liquid that shows Capillary fall?

Answer

Mercury

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Subject: Physics

Q:

Which is the strongest force in the universe?

Answer

Nuclear Force

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Subject: Physics

Q:

Which is the weakest force in the universe?

Answer

Gravitational Force

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Subject: Physics

Q:

Which law is also called law of inertia ?

A) Newton first law	B) Newton second law
C) Newton third law	D) All of above

Answer & Explanation Answer: A) Newton first law

Explanation:

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Q:

The working of the quartz crystal in the watch is based on the

A) Piezo - electric Effect	B) Edison Effect
C) Photoelectric Effect	D) Johnson Effect

Answer & Explanation Answer: A) Piezo - electric Effect

Explanation:

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Filed Under: Physics

Q:

The working principle of a washing machine is

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

Answer & Explanation 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.

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