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Class 11 Physics (Part I) Chapter 1 Physical World And Measurement Quiz 3 (25 MCQs)

Quiz Instructions

Select an option to see the correct answer instantly.

1. Newtonian mechanics could not explain

Correct Answer: B) Some of the most basic features of atomic phenomena.

2. Wave picture of light failed to explain.

Correct Answer: A) The photoelectric effect.

3. If the length and time period of an oscillating pendulum have errors of 1% and 3% respectively then the error in measurement of acceleration due to gravity

Correct Answer: B) 7%.

4. "The most incomprehensible thing about the world is that it is comprehensible." Who said so:

Correct Answer: A) Copernicus.

5. If dimension of critical velocity v$_{c}$ of a liquid flowing through a tube are expressed as [n$^{x }$p$^{y }$r$^{z}$], where n p and r are the coefficient of viscosity of liquid density of liquid and radius of the tube respectively, then the values of x, y and z are given by

Correct Answer: A) 1, -1, -1.

6. What is the dimensional formula of torque and energy

Correct Answer: C) $[ML^2T^{-2}]and[ML^2T^2]$.

7. A new unit of length is chosen such that the speed of light in a vacuum is unity. What is the distance between the Sun and the Earth in terms of the new unit if light takes 8 min and 20 s to cover this distance?

Correct Answer: A) 500 new units.

8. In a particular system, the unit of length mass and time are chosen to be 10cm, 10 g and 0.1 s respectively. The unit of force in this system will be equivalent to

Correct Answer: A) 0.1 N.

9. The Dimensional formula for permeability of free space, $\mu$$_{0}$ is

Correct Answer: A) [MLT$^{-2}$A$^{-2}$].

10. Heliocentric theory proposed by Nicolas Copernicus was

Correct Answer: B) Replaced by elliptical orbits to fit the data better.

11. The sides of a rectangle are 6.01 m and 12 m. Taking the significant figures into account, the area of the rectangle is

Correct Answer: A) 72 m$^{2}$.

12. Chandrashekhar limit is the largest practical unit of

Correct Answer: B) Mass.

13. Which of the following pairs of physical quantities have same dimension?

Correct Answer: B) Torque and energy.

14. The dimensional formula of Planck's constant h is .....

Correct Answer: A) [ML$^{2}$T $^{-1}$ ].

15. A scientific theory

Correct Answer: D) Can be revised if required to fit new phenomenon or data.

16. The dimensional formual for angular

Correct Answer: B) [ML$^{2}$T$^{-1}$].

17. Which of the following will have the dimensions of time?

Correct Answer: C) L/R.

18. Which of the following quantity is not a fundamental quantity?

Correct Answer: C) Volume.

19. Which of the following is a possible final step in applying the scientific method

Correct Answer: C) Analysis of test results.

20. Dimensions of resistance in an electrical circuit, in terms of dimension of mass M, of length L, of time T and of current I, would be

Correct Answer: D) [ML$^{2}$ T$^{-3}$I$^{-2 }$].

21. Choose TWO(2) examples of base quantity

Correct Answer: C) Length and mass.

22. If the dimensions of a physical quantity are given by [M$^{a}$L$^{b}$ T$^{c}$], then the physical quantity will be

Correct Answer: A) Pressure if a =1, b =-1, c =-2.

23. Which two of the following five physical parameters have the same dimensions?(i) Energy Density (ii) Refractive index (iii) Dielectric constant (iv) Young's modulus (v) Magnetic field

Correct Answer: A) (i) and (iv).

24. From the given three fundamental constants, select the combination that gives the dimension of length(i) Newton's gravitational constant (G)(ii) Speed of light in a vacuum (c)(iii) Planck's constant (h)

Correct Answer: D) $\sqrt{\frac{hG}{c^{\frac{3}{2}}}}$.

25. The dimensional formula of pressure is

Correct Answer: C) [ML$^{-1}$T$^{-2}$].

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