XI Phy SRM Gr.4

In the equation E = hf, E is energy, h is Planck’s constant and f is frequency. The unit of h is -------.

• N-s

• J-s

• J/s

• $kgms^{-2}$

In the formula  $F=-\frac{Gm_1m_2}{r^2}$  , F is force,  $m_1$   and  $m_2$   are masses and r is the distance between them. The dimensional formula of G is -------.

•  $M^{-1}L^3T^{-2}$  

•  $ML^2T^{-2}$  

•  $MLT^{-2}$  

•  $MLT^{-3}$  

What is the dimension of length in the dimensional formula for pressure?

• 1

• -1

• -2

• 2

Which two quantities have same dimensional formula?

• velocity and momentum

• work and torque

• momentum and force

• work and power

If a physical quantity depends on --------, dimensional analysis cannot be used. Please choose the wrong choice.

• linear function

• trigonometric function

• logarithmic function

• exponential function

How many significant figures are there in the value of  $\pi$ ? 

• 3

• 4

• 5

• INFINITY

Length of a cube is given by l = 2.67 ± 0.01 cm. Percentage error in its volume is ------- %

• 1.12

• 19.03

• 2.88

• 5.234

Length of a simple pendulum is l = 70 ± 0.1 cm and its period T = 1.68 ± 0.01 s. What is the percentage error in the measurement of g using this pendulum?

• 1.33 %

• 1.65 %

• 2.45 %

• 21.8 %

Formula for A is given by  $A=\frac{p^3q^{-4}}{r^2s^{\frac{1}{3}}}$    . The quantity which should be measured more accurately is -------. 

• p

• q

• r

• s

Four observations of thickness of a rod is 3.43 cm, 3.49 cm , 3.41 cm and 3.45 cm. Which reading has more error?

• 3.49

• 3.45

• 3.43

• 3.41