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Q:

What is the process of slow cooling of hot glass called?

A) Annealing B) Humidifying
C) Condensation D) Decantation
 
Answer & Explanation Answer: A) Annealing

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Q:

The basic concept of Montessori education is

A) Discovery by travelling B) Dreaming
C) Communicating D) Self-discovery through experiment
 
Answer & Explanation Answer: D) Self-discovery through experiment

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Q:

On 22 November 2017, cabinet approved expansion of which mission for a Pan India coverage in all the 640 districts of the country?

A) Make in India B) Swatchh Bhara
C) Beti Bachao Beti padhao D) Skill India
 
Answer & Explanation Answer: C) Beti Bachao Beti padhao

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Q:

Sunspots appear dark because they are

A) hotter than the rest of the Sun's surface. B) more magnetic than the rest of the Sun's surface. 
C) cooler than the rest of the Sun's surface. D) None of the above
 
Answer & Explanation Answer: C) cooler than the rest of the Sun's surface.

Explanation:

Sunspots are a magnetic phenomenon on the Sun.

The reason a sunspot appears dark is that they are cooler than the rest of the Sun's surface and also the gas inside the spot where the magnetic field is strongest is only emitting about 1/4 as much light as from the rest of the solar surface. 

 

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Filed Under: Physics
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Q:

A ball is dropped from a height of 10 m. It strikes the ground and rebounds up to a height of 2. m. During the collision, the per cent loss in the kinetic energy is

A) 100% B) 25%
C) 50% D) 75%
 
Answer & Explanation Answer: D) 75%

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Q:

If I is the current through a wire and e is the charge of an electron, then the number of electrons crossing in t seconds will be given by

A) e/It B) It/e
C) Ie/t D) Ite
 
Answer & Explanation Answer: B) It/e

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Q:

The quantum theory of light was given by

A) Einstein B) Newton
C) Plank D) Faraday
 
Answer & Explanation Answer: C) Plank

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Q:

In which of the following countries India celebrated a cultural festival named ‘India by the Nile’ in 2017?

A) Iran B) Brazil
C) Egypt D) UAE
 
Answer & Explanation Answer: C) Egypt

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