# A dimensionless quantity 1. never has a unit 2. always has a unit 3. may have a unit 4. does not exist

Subtopic:  Dimensions |
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A unitless quantity

1. never has a nonzero dimension

2. always has a nonzero dimension

3. may have a nonzero dimension

4. does not exist

Subtopic:  Dimensions |
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$$\int \frac{\mathrm{dx}}{\sqrt{2 \mathrm{ax}-\mathrm{x}^{2}}}=\mathrm{a}^{\mathrm{n}} \sin ^{-1}\left[\frac{\mathrm{x}}{\mathrm{a}}-1\right]$$
The value of n is
You may use dimensional analysis to solve the problem.

1. 0

2. -1

3. 1

4. none of these

Subtopic:  Dimensions |
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The dimensions of ML–1T–2 may correspond to

(a) work done by a force

(b) linear momentum

(c) pressure

(d) energy per unit volume

Choose the correct option:

1. (a) and (b)

2. (b) and (c)

3. (c) and (d)

4. None of the above

Subtopic:  Dimensions |
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Choose the correct statement(s) :

(a) A dimensionally correct equation may be correct

(b) A dimensionally correct equation may be incorrect

(c) A dimensionally incorrect equation may be correct

(d) A dimensionally incorrect equation may be incorrect

Choose the correct option:

1. (a), (b) and (c)

2. (a), (b) and (d)

3. (b), (c) and (d)

4. None of these

Subtopic:  Dimensions |
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Choose the correct statement(s) :

(a) All quantities may be represented dimensionally in terms of the base quantities

(b) A base quantity cannot be represented dimensionally in the terms of the rest of the base quantities

(c) The dimension of a base quantity in other base quantities is always zero

(d) The dimension of a derived quantify is never zero in any base quantity

Choose the correct option:

1. (a), (b) and (c)

2. (b), (c) and (d)

3. (a), (c) and (d)

4. None of the above

Subtopic:  Dimensions |
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The radius of a circle is stated as 2.12 cm. Its area should be written as

1. 14 cm2

2. 14.1 cm2

3. 14.11 cm2

4. 14.1124 cm2

Subtopic:  Significant Figures |
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Which of the following pairs represent units of the same physical quantity ?

1.  kelvin and joule

2.  kelvin and calorie

3.  newton and calorie

4.  joule and calorie.

Subtopic:  Dimensions |
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Suppose a quantity x can be dimensionally represented in terms of M, L and T that is [x] = Ma Lb Tc. The quantity mass

1. can always be dimensionally represented in terms of L, T and x

2. can never be dimensionally represented in terms of L, T and x

3. may be represented in terms of L, T and x if a = 0

4. may be represented in terms of L, T and x if a ≠ 0

Subtopic:  Dimensions |
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A physical quantity is measured and the result is expressed as nu where u is the unit used and n is the numerical value. If the result is expressed in various units then

1. $$n\propto size~of~u$$

2. $$n\propto u^2$$

3. $$n\propto \sqrt u$$

4. $$n\propto \frac{1}{u}$$

Subtopic:  Dimensions |
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