Q:

Device used for the detection and measurement of all types of radiation (alpha, beta and gamma)

A) Geiger counter	B) Polarimeter
C) Calorimeter	D) Radiometer

Answer & Explanation Answer: A) Geiger counter

Explanation:

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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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Q:

What is Syzygy?

A) Position of sun, earth and moon in the straight line	B) Earth's position between Sun and Moon
C) Sun and Moon position on one side of the Earth	D) The right angle position of Moon from the Sun and Earth

Answer & Explanation Answer: A) Position of sun, earth and moon in the straight line

Explanation:

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Q:

The outermost layer of Earth is called _______.

A) Sphere	B) Crust
C) Mantle	D) Core

Answer & Explanation Answer: B) Crust

Explanation:

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Q:

Pentane has _____ structural isomers.

A) 1	B) 2
C) 3	D) 4

Answer & Explanation Answer: C) 3

Explanation:

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Q:

The amount of BaSO4 formed on mixing an aqueous solution of 2.08 gm of BaCl2 and excess of dilute H2SO4 is ___.

(atomic weights : Ba = 137, Cl = 35.5, S = 32, O = 16)

A) 2.33 g	B) 2.08 g
C) 23.3 g	D) 1.04 g

Answer & Explanation Answer: A) 2.33 g

Explanation:

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Q:

In the following question, a sentence has been given in Direct/Indirect speech. Out of the four alternatives suggested, select the one which best expresses the same sentence in Indirect/Direct speech.
Neha said, "Need I write a letter?"

A) Neha asked if she have to write a letter.	B) Neha asked if she had been writing a letter.
C) Neha asked of writing a letter.	D) Neha asked if she had to write a letter.

Answer & Explanation Answer: D) Neha asked if she had to write a letter.

Explanation:

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Q:

How many groups and periods are present in the Modern Periodic Table?

A) 9 groups, 9 periods	B) 7 groups, 8 periods
C) 18 groups, 7 periods	D) 8 groups, 7 periods

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