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Class 11 Physics (Part I) Chapter 1 Physical World And Measurement Quiz 4 (25 MCQs)

Quiz Instructions

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1. In an experiment, four quantities a, b, c and d are measured with percentage error 1%, 2%, 3% and 4% respectively. Quantity P is calculated P= $^{a3b2}$/$_{cd}$ %. Error in P is

Correct Answer: A) 14%.

2. Dimensional formula of self-inductance is

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

3. Which one of the following represents the correct dimensions of the coefficient of viscosity?

Correct Answer: C) M L$^{-1 }$T$^{-1}$.

4. How many numbers of base SI units are there?

Correct Answer: C) 7.

5. Ust as a new experiment may suggest an alternative theoretical model, a theoretical advance may suggest what to look for in some for in some experiments. Which of the following experiments can be considered to support this claim?

Correct Answer: C) Experimental discovery of positron.

6. A thought experiment in physics is one

Correct Answer: B) Which is neither theoretically nor experimentally feasible.

7. Planck's constant has the dimensions of

Correct Answer: B) Angular momentum.

8. All the following physical quantities are derived quantities except .....

Correct Answer: D) Mass.

9. If x = $\alpha$t +bt$^{2}$, where x is the distance travelled by the body in kilometer while t is the time in second, then the unit of b is

Correct Answer: C) Km/s$^{2}$.

10. Define vector quantity.

Correct Answer: B) Quantity which has both magnitude and direction.

11. The number of significant figures in 0.00040 m is

Correct Answer: B) 2.

12. The Dimension of Boltzmann constant is .....

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

13. The value of 0.99-0.989 is

Correct Answer: C) 0.01x10$^{-1}$.

14. High precision instruments are used to eliminate

Correct Answer: C) Least count error.

15. Which the following is a dimensionless quantity

Correct Answer: A) Refractive index.

16. A Certain body weighs 22.42 g and has a measured volume of 4.7cc, The possible error in the measurement of mass and volume are 0.01g and 0.1 cc. Then maximum error in the density will be

Correct Answer: B) 0.2%.

17. Two quantities are given in which one of which is a vector and another one is a scalar having the same dimensional formula are:

Correct Answer: B) Torque and work.

18. The velocity of a particle v at an instant t is given by v = at +bt $^{2}$ . The dimensions of b is

Correct Answer: D) [LT$^{-3}$].

19. Calculate the value of the dot product of the two vectors whose magnitudes are 3 units and 4 units and their resultant is 1 unit.

Correct Answer: D) -12 units.

20. If the error in the measurement of radius of a sphere is 2%, then the error in the determination of volume of the sphere will be

Correct Answer: B) 6%.

21. The unit of permittivity of free space, E$_{0}$ is

Correct Answer: C) Coulomb$^{2}$/newton-metre$^{2}$.

22. Physics is a

Correct Answer: B) Natural Science.

23. Zero error of an instrument introduces:

Correct Answer: A) Systematic error.

24. Find SI unit of density

Correct Answer: D) Kg/m$^{3}$.

25. Which of the following the smallest unit:

Correct Answer: C) Fermi.

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