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Questions and Answers
4096. Heavy water is

A
Deuterium

B
Deuterium oxide

C
Tritium oxide

D
Rain water

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4097. A thick paste of cement, sand & water is called

A
Mortar

B
R.C.C.

C
Kiln

D
Concrete



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Answer & Explanation
Answer : Option A
Explanation :
Mortar.Mortar is a workable paste used to bind construction blocks together & fill the gaps between them. Modern mortars are typically made from a mixture of sand, a binder such as cement or lime, & water.
4098. Tear gas used by the police to disperse the mob contains

A
hydrogen sulphide

B
chlorine

C
ammonia

D
carbon dioxide

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Answer & Explanation
Answer : Option B
Explanation :
chlorine.Tear gas is a compound. The compound 2- chlorobenzalmalononitrile, a cyanocarbon, is the defining component of a 'tear gas' commonly referred to as CS gas, which is used as a riot control agent. Each molecule of tear gas contains one atom of chlorine.
4099. Choose the inright statement from the following:

A
Nuclei with atomic number greater than 82 show a tendency to disintegrate

B
The nuclear force becomes very strong if the nucleus contains a large number of nucleons

C
The nuclear force becomes weak if the nucleus contains too many protons compared to the number of neutrons

D
The nuclear force becomes weak if the nucleus contains too many neutrons compared to the number of protons



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Answer & Explanation
Answer : Option B
Explanation :
4100. Cloud is a colloidal dispersion of

A
Mist in a dispersion medium of air

B
Air in a dispersion medium of water

C
Water drops in a dispersion medium of air

D
Fog in a dispersion medium of water

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Answer & Explanation
Answer : Option C
Explanation :
A colloid is a substance microscopically dispersed evenly throughout another substance. A colloidal system consists of two separate phases: a dispersed phase (or internal phase) & a continuous phase (or dispersion medium) in which the colloid is dispersed. A colloidal system may be solid, liquid, or gas. Cloud is a colloidal dispersion of Water drops in a dispersion medium of air.

fusion reactions.Nuclear Fusion Reaction is the process which is responsible for the sun to radiate energy in the form of light & heat commonly known as solar energy. Fusion occurs when hydrogen atoms fuse together under extreme heat & pressure to create a denser helium atom releasing, in the process, colossal

Poles.A perfect sphere of spherically uniform density (density varies solely with distance from centre) would produce a gravitational field of uniform magnitude at all points on its surface, always pointing directly in the direction of the sphere's centre. Furthermore, the net force exerted on an object due to the Earth, called 'effective gravity' or 'apparent gravity', varies due to the presence of other factors, such as inertial response to the Earth's rotation. However, the Earth deviates slightly from this ideal, & there are consequently slight deviations in both the magnitude & direction of gravity across its surface. A scale or plumb bob measures only this effective gravity. The major reason for the difference in gravity at different latitudes is that the Earth's equatorial bulge (itself also caused by inertia) causes objects at the Equator to be farther from the planet's centre than objects at the poles. As the force due to gravitational attraction between two bodies (the Earth & the object being weighed) varies inversely with the square of the distance between them, an object at the Equator experiences a weaker gravitational pull than an object at the poles.