Q:

Which subatomic particle has no charge?

A) electron	B) neutron
C) proton	D) All of the above

Answer & Explanation Answer: B) neutron

Explanation:

An atom is composed of three subatomic particles. They are ::

1) Electron (-vely charged particle)

2) Proton (+vely charged particle)

3) Neutron (No charge particle)

Hence, Neutron is the subatomic particle which has no charge.

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Q:

Resistivity of a wire depends on

A) Length	B) Area of cross section
C) Material	D) All of above

Answer & Explanation Answer: C) Material

Explanation:

The resistivity of wire or the metal conductor is depend on the number density of free electrons in the conductor. so its mainly depends on nature of the material

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Q:

Which statement about subatomic particles is not true?

A) Protons and neutrons have the same charge	B) Protons and electrons have the opposite charhes
C) Protons and neutrons have almost the same mass	D) All of the above

Answer & Explanation Answer: A) Protons and neutrons have the same charge

Explanation:

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Q:

Select the correct statement about the ureters.

A) The ureter is innervated by parasympathetic nerve endings only.	B) Ureters contain sphincters at the entrance to the bladder to prevent the backflow of urine.
C) The epithelium is stratified squamous like the skin, which allows a great deal of stretch.	D) The ureters are capable of peristalsis like that of the gastrointestinal tract.

Answer & Explanation Answer: D) The ureters are capable of peristalsis like that of the gastrointestinal tract.

Explanation:

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Q:

Strength of concrete increases with

A) increase in fineness of cement	B) decrease in size of aggregate
C) increase in water cement ratio	D) decrease in curing time

Answer & Explanation Answer: C) increase in water cement ratio

Explanation:

Strength of concrete increases with increase in water cement ratio as the strength of the cement is directly proportional to water cement ratio.

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Q:

Which material provides warmth even when wet?

A) Cotton	B) Wool
C) Nylon	D) Silk

Answer & Explanation Answer: B) Wool

Explanation:

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Q:

A wire of copper having length I and area of cross-section A is taken and a current / is flown through it. The power dissipated in the wire is P. If we take an aluminium wire having same dimensions and pass the same current through it, the power dissipated will be

A) P	B) < P
C) > P	D) 2P

Answer & Explanation Answer: C) > P

Explanation:

Aluminum has a resistivity varying from 2.65 to 2.82 × 10−8 Ω m.The resistivity of copper is generally given as: 1.72 x 10-8 Ω.m.So, since resistivity of aluminium is higher than that of copper, so Power dissipated will be greater than P. this is because rest of the factors (l, A and i) are constant.

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Q:

Which statement correctly describes the role of chance in evolution?

A) An allele that increases evolutionary fitness cannot be lost from a population by chance events.	B) The ultimate source of new alleles is mutation, random changes in the nucleotide sequences of an organism's DNA
C) Evolutionary change proceeds by an accumulation of changes that occur by chance.	D) None of the above

Answer & Explanation Answer: B) The ultimate source of new alleles is mutation, random changes in the nucleotide sequences of an organism's DNA

Explanation:

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