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Q:

When the Sun is near the horizon during the morning or evening, it appears reddish. The phenomenon that is responsible forth is observation is

A) reflection of light	B) refraction of light
C) dispersion of light	D) scattering of light

Answer & Explanation Answer: D) scattering of light

Explanation:

According to Rayleigh's law, the intensity of scattered light varies inversely as the fourth power of its wavelength. Sunlight consists of seven colours. Of these, red has the maximum wavelength. During sunrise and sunset, the rays have to travel a larger part of the atmosphere because they are very close to the horizon.Therefore, light other than red is mostly scattered away. Most of the red light, which is the least scattered, enters our eyes. Hence, the sun and the sky appear red.

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Filed Under: Physics
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Q:

If South-East is changed to North and North-East to West and so on, then what will come in place of South?

A) South-West	B) North-East
C) South-East	D) North-West

Answer & Explanation Answer: B) North-East

Explanation:

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Q:

Two metallic wires made from copper have same length but the radius of wire 1 is half of that of wire 2. The resistance of wire 1 is R. If both the wires are joined together in series, the total resistance becomes

A) 2R	B) R/2
C) 5R/4	D) 3R/4

Answer & Explanation Answer: C) 5R/4

Explanation:

So, resistance of Wire 2 is R/4 as radius is half of wire 1, so area would be 4 times of wire 1.

Now for resistance in series. R= R1 + R2.

Therefore, Final R= R + R/4 = 5R/4

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3 2091

Q:

Which of the following represents a relation for ‘heat lost = heat gained’?

A) Principle of thermal equilibrium	B) Principle of colors
C) Principle of calorimetry	D) Principle of vaporization

Answer & Explanation Answer: C) Principle of calorimetry

Explanation:

Heat lost by hot object = Heat gained by cold object

where we ignore heat gained or lost from/to the surroundings.

The study of heat gained and lost in this manner is often called Calorimetry.

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Q:

Which one of the following elements will be an isobar of calcium if the atomic number of calcium is 20 and its mass number is 40?

A) Element with 18 neutrons and 20 protons	B) Element with 19 neutrons and 18 protons
C) Element with 19 neutrons and 20 protons	D) Element with 18 neutrons and 22 neutrons

Answer & Explanation Answer: D) Element with 18 neutrons and 22 neutrons

Explanation:

Isobar: one of two or more atoms having equal atomic weights but different atomic numbers.

Mass number Electrons Neutrons

Calcium 40 20 20

Argon 40 18 22

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Filed Under: Chemistry
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0 1377

Q:

Find the missing numbers from the given alternatives

A) 73	B) 68
C) 101	D) 55

Answer & Explanation Answer: A) 73

Explanation:

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Filed Under: Inserting The Missing Character
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12 1435

Q:

If 13*45 = 29 ,
24*58 = 41 ,
74*32 = 53 ,
what should 97*47 be?

A) 73	B) 72
C) 63	D) 64

Answer & Explanation Answer: B) 72

Explanation:

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Filed Under: Mathematical Operations
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2 1113

Q:

If 'L' stands for '+' , 'M' stands for '-' , N stands for 'x' , P stands for '÷' then

14 N 10 L 42 P 2 M 8 = ?

A) 153	B) 216
C) 248	D) 251

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