Q:

The theory behind stars twinkling is that

A) The refractive index of the different layers of earth's atmosphere changes continuously, consequently the position of the star's image changes with time	B) The intensity of light emitted by them changes with time
C) The light from the star is scattered by the dust particles and air molecules in the earth's atmosphere	D) The distance of the stars from the earth changes with time

Answer & Explanation Answer: A) The refractive index of the different layers of earth's atmosphere changes continuously, consequently the position of the star's image changes with time

Explanation:

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Q:

What is the heat generated (in J) in a heating element of resistance 800 Ω when a current of 0.2 A passes through it for 40 seconds?

A) 6400	B) 1280
C) 640	D) 3200

Answer & Explanation Answer: B) 1280

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Q:

A solar eclipse occurs when

A) moon comes in the middle of sun and earth	B) sun comes in the middle of moon and earth
C) earth comes in the middle of moon and sun	D) All of the above

Answer & Explanation Answer: A) moon comes in the middle of sun and earth

Explanation:

A solar eclipse happens when the moon gets in the way of the sun's light and casts its shadow on Earth. Solar eclipses happen when the New Moon comes between the Sun and Earth and blocks out the Sun's rays.

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Q:

The rate of change of velocity is called

A) Momentum	B) Speed
C) Acceleration	D) Force

Answer & Explanation Answer: C) Acceleration

Explanation:

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Q:

Mirages are formed primarily due to ___ of light.

A) Reflection	B) Diffusion
C) Refraction	D) Scattering

Answer & Explanation Answer: C) Refraction

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Q:

A unit of power is called a

A) Joule	B) Pascal
C) Newton	D) Watt

Answer & Explanation Answer: B) Pascal

Explanation:

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Q:

The Typhoon named 'Goni' has recently hit which country?

A) Philippines	B) United States of America
C) Indonesia	D) Australia

Answer & Explanation Answer: A) Philippines

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Q:

The G-20 Summit in November 2015 was organized in which European Country?

A) Germany	B) Turkey
C) France	D) Spain

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