Q:

The relative density of a substance is the ____.

A) ratio of its density to the density of water	B) ratio of the density of water to its density
C) product of the density of water to its density	D) ratio of the volume of water to its volume

Answer & Explanation Answer: A) ratio of its density to the density of water

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1 43529

Q:

Plaster of Paris ______.

I. changes into gypsum on mixing with water

II. is CaSO4.2H2O

III. is used for decoration

A) Only I and II	B) Only I and III
C) Only II and III	D) All I, II and III

Answer & Explanation Answer: B) Only I and III

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Q:

What is the position of metallic ion and non-metallic ion in a chemical formula?

A) Metal ion at second position	B) Non-metal ion at first position
C) Metal ion at first and non-metal ion at second position	D) No option is correct

Answer & Explanation Answer: C) Metal ion at first and non-metal ion at second position

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Q:

An electron loses potential energy when it

A) shifts to a more electronegative atom.	B) increases its kinetic energy.
C) shifts to a less electronegative atom.	D) increases its activity as an oxidizing agent.

Answer & Explanation Answer: A) shifts to a more electronegative atom.

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Q:

An object is placed at the centre of curvature of a concave mirror. Its image is formed at

A) a point beyond centre of curvature	B) a point between focus and centre of curvature
C) the centre of curvature	D) the focus

Answer & Explanation Answer: B) a point between focus and centre of curvature

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Q:

What is formed when helium atom loses one electron?

A) Proton	B) Positive helium ion
C) Negative helium ion	D) Alpha particle

Answer & Explanation Answer: B) Positive helium ion

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Q:

DRDL stands for

A) Defence Research and Development Laboratory	B) Department of Research and Development Laboratory
C) Differential Research and Documentation Laboratory	D) None of the above

Answer & Explanation Answer: A) Defence Research and Development Laboratory

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Filed Under: General Awareness

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Q:

Valency of an element depends on which of the following?

I. Number of losing electron

II. Number of gaining electron

III. Number of sharing electron

A) Only I and II	B) Only I and III
C) Only II and III	D) All I, II and III

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