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Question (21)

QN0034622

The unit of permittivity of free space, is

(A)
coulomb
(B)
coulomb/newton-metre
(C)
newton-meter coulomb
(D)
coulomb newton-metre

Correct Answer: D

Explanation:

unit of is (coulomb) newton-metre

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Question (22)

QN0034623

The electric field is given by . The SI units of A, B and C are respectively: [where and are in ]

(A)
(B)
(C)
(D)

Correct Answer: A

Explanation:

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Question (23)

QN0034624

and denote energy, mass, angular momentum and gravitational constant respectively, then the unit of is

(A)
newton
(B)
metre
(C)
kilogram
(D)
second.

Correct Answer: D

Explanation:

(d) Unitless quantity.

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Question (24)

QN0034625

Velocity (v) and acceleration (a) in two systems of units 1 and 2 are related as and respectively. Here and are constants. The relations for distance and time in two systems respectively are:

(A)
and
(B)
and
(C)
and
(D)
and

Correct Answer: A

Explanation:

(a) Given,

and,

Dividing (ii) by (i), we get,

as,

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Question (25)

QN0034626

If unit of length and force are increased 4 times. The unit of energy

(A)
is increased by 4 times
(B)
is increased by 16 times
(C)
is increased by 8 times
(D)
remains unchanged

Correct Answer: B

Explanation:

(b) The work done force displacement unit, and .

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Question (26)

QN0034627

The density of a material in CGS system of units is . In a system of units in which unit of length is and unit of mass is , the value of density of material will be

(A)
0.4
(B)
40
(C)
400
(D)
0.04

Correct Answer: B

Explanation:

(b) In CGS system,

The unit of mass is and unit of length is , so

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Question (21)

The unit of permittivity of free space, is

Explanation:

Link:

Question (22)

The electric field is given by . The SI units of A, B and C are respectively: [where and are in ]

Explanation:

Link:

Question (23)

and denote energy, mass, angular momentum and gravitational constant respectively, then the unit of is

Explanation:

Link:

Question (24)

Velocity (v) and acceleration (a) in two systems of units 1 and 2 are related as and respectively. Here and are constants. The relations for distance and time in two systems respectively are:

Explanation:

Link:

Question (25)

If unit of length and force are increased 4 times. The unit of energy

Explanation:

Link:

Question (26)

The density of a material in CGS system of units is . In a system of units in which unit of length is and unit of mass is , the value of density of material will be

Explanation:

Link:

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