FBISE, NCP & NBF-aligned resources for Classes 9–12

/35

Physics Chapter 1 : Topic 3

Formula Derivation by Dimensional Analysis

1 / 35

A simple pendulum has time period ‘$\mathbf{T}$’ depending on length ‘$\mathbf{l}$’ and gravitational acceleration ‘$\mathbf{g}$’. Using dimensional analysis, the form of ‘$\mathbf{T}$’ is:

2 / 35

If $\mathbf{T \propto}\mathbf{l}^{\mathbf{a\ }}\mathbf{g}^{\mathbf{b}}$, then the value of ‘$\mathbf{a}$’ for a simple pendulum is:

3 / 35

The time period of a pendulum is independent of:

4 / 35

Escape velocity ‘$\mathbf{v}$’ depends on gravitational acceleration ‘$\mathbf{g}$’ and radius ‘$\mathbf{r}$’ of a planet. The correct dimensional formula is:

5 / 35

The dimensions of $\mathbf{gr}$ are:

6 / 35

The speed of waves on a stretched string depends upon tension ‘$\mathbf{F}$’ and mass per unit length ‘$\mathbf{\mu}$’. The correct relation is:

7 / 35

If $\mathbf{v \propto}\mathbf{F}^{\mathbf{a\ }}\mathbf{\mu}^{\mathbf{b}}$, the value of ‘$\mathbf{a}$’ is:

8 / 35

The dimensions of mass per unit length are:

9 / 35

The kinetic energy ‘$\mathbf{E}$’ of a body depends on mass ‘$\mathbf{m}$’ and velocity ‘$\mathbf{v}$’. Dimensional analysis predicts:

10 / 35

Dimensional analysis cannot determine:

11 / 35

The force ‘$\mathbf{F}$’ acting on a body depends on mass ‘$\mathbf{m}$’ and acceleration ‘$\mathbf{a}$’. Dimensional analysis gives:

12 / 35

In dimensional analysis, if the number of unknown exponents exceeds the number of fundamental dimensions, then:

13 / 35

If pressure ‘$\mathbf{P}$’ depends on force ‘$\mathbf{F}$’ and area ‘$\mathbf{A}$’, then:

14 / 35

Which quantity is commonly expressed as $\mathbf{v \propto}\sqrt{\mathbf{gr}}\mathbf{\ }$?

15 / 35

If a formula derived dimensionally is $\mathbf{Q \propto}\mathbf{a}^{\mathbf{2}}\mathbf{\ }\mathbf{b}^{\mathbf{- 1}}$, then increasing $\mathbf{a}$ by $\mathbf{2}$ times changes $\mathbf{Q}$ by:

16 / 35

The dimensions of energy are:

17 / 35

A student derives $\mathbf{T = k}$ $\sqrt{\frac{\mathbf{l}}{\mathbf{g}}}$. The symbol $\mathbf{k}$ represents:

18 / 35

The speed of a wave depends on tension ‘$\mathbf{F}$’ and linear density ‘$\mathbf{\mu}$’. If tension becomes four times, speed becomes:

19 / 35

A formula derived dimensionally is most useful for:

20 / 35

If gravitational acceleration becomes four times, the period of a pendulum becomes:

21 / 35

Which quantity has dimensions $\mathbf{\lbrack}\mathbf{M\ L}^{\mathbf{- 1}}\mathbf{\rbrack}$?

22 / 35

If length of a pendulum becomes four times, its period becomes:

23 / 35

Which of the following can be derived using dimensional analysis?

24 / 35

If escape velocity $\mathbf{v \propto}\sqrt{\mathbf{gr}}$, doubling radius while keeping$\mathbf{g}$ constant makes $\mathbf{v}$:

25 / 35

If $\mathbf{Q \propto}\mathbf{a}^{\mathbf{x}}\mathbf{\ }\mathbf{b}^{\mathbf{y}}$, dimensions are compared to:

26 / 35

Why is dimensional analysis called a powerful tool?

27 / 35

Which step comes first in dimensional derivation?

28 / 35

Which formula cannot be completely obtained by dimensional analysis?

29 / 35

The dimensions of $\mathbf{F\ /\ \mu}$ are:

30 / 35

Taking square root of $\mathbf{F\ /\ \mu}$ gives dimensions of:

31 / 35

Which of the following is a limitation of dimensional analysis?

32 / 35

If kinetic energy depends on mass and velocity only, dimensional analysis predicts the power of velocity to be:

33 / 35

The dimensions of $\mathbf{g\ /\ }\mathbf{l}$ are:

34 / 35

The square root of $\mathbf{g\ /\ }\mathbf{l}$ has dimensions:

35 / 35

A correct dimensional derivation requires:

Your score is

0%

9th class objective books