Physical World & Measurement

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1. light year is the unit of *

1 point

Time

Length

Year

Velocity

2. kilowatt hour is the unit of *

1 point

power

energy

time

mass

3. Identify the physical quantity with the dimension [ML1T-1] *

1 point

momentum

mass

velocity

acceleration

4. Identify the physical quantity with the dimension [ML2T-2] *

1 point

pressure

couple acting on a body

elasticity

moment of inertia

5. Which measurement is more precise? *

1 point

Vernier Calipers having 20 divisions on sliding scale

Vernier Calipers having 10 divisions on sliding scale

Vernier Calipers having 5 divisions on sliding scale

6. What happens to the accuracy when the least count is decreased? *

1 point

Increases

decreases

7. Pick out the fundamental unit from the following *

1 point

newton

second

joule

m/s

8. The weakest force found in nature *

1 point

Weak nuclear force

Electromagnetic force

Gravitational force

Strong nuclear force

9. For an equation x = a + bt + ct2; where x is in metre and t is in second, what will be the dimension of b ? *

1 point

LT-1

LT-2

10. The radius of a sphere is given by R = 1.03m. How many significant figures are there in it? *

1 point

Option 1

11. If the % error in calculating the radius of a sphere is 2%, what will be the percentage error in calculating the volume? *

1 point

12. Dimension of force is ............... *

1 point

MLT-1

MLT-2

ML2T-2

MLT

13. Centripetal force F = mv2/r. The formula to find the %error in F is : *

1 point

(deltaF/f)x100 = (delta m/m)x100 + 2(delta v/v)x100 + (delta r/r)x100

(deltaF/f)x100 = (delta m/m)x100 + 2(delta v/v)x100 - (delta r/r)x100

(deltaF/f)x100 = (delta m/m)x100 + ((delta v/v)x100)2 + (delta r/r)x100

(deltaF/f)x100 = (delta m/m)x100 + (delta v/v)x100 + (delta r/r)x100

14. What is the number of significant figures in 0.050N? *

1 point

15. Length, breadth and thickness of block is measured using Vernier Calipers. The percentage error in the measurements are 2%, 1% and 3% respectively. The percentage error in its volume is *

1 point

16. A physical quantity is given by h = Fv2/L; where F = force, v = velocity and L is the angular momentum. Find the dimensions of h. *

1 point

LT2

LT-3

LT-2

LT3

17. Choose the wrong statement from the following *

1 point

Nuclear force binds electrons and protons in a nucleus

Electromagnetic force is the force between charged particles

Electrostatic force can be attractive or repulsive

Gravitational force is one of the most strongest forces among fundamental forces

18. If the percentage error of measurement in velocity and mass are 2% and 4% respectively, what is the percentage error in Kinetic energy? *

1 point

16%

10%

19. Which of the following force is present between all objects in the universe *

1 point

Electromagnetic force

Strong nuclear force

Gravitational force

Magnetic force

20. The error in the measurement of radius of a circle is 0.6%. Find the percentage error in the calculation of the area of the circle. *

1 point

0.6%

12%

1.2%

21. What is the number of significant figures in 0.00820 J? *

1 point

22. Which of the following forces in nature binds together protons and neutrons? *

1 point

Weak nuclear force

Gravitational force

Strong nuclear force

Electromagnetic force

23. Length of a sheet is 17.3+-0.3 cm and breadth of sheet is 3.12 +-0.08 cm. Find the percentage error in the area. (Note +- should be read as plus or minus) *

1 point

53.98

53.98+ - 0.38

0.5

4.29

24. Pick the odd one out from the following *

1 point

Gravitational force

Weak nuclear force

Viscous force

Electromagnetic force

25. The ratio of electrostatic force and gravitational force between two protons is (Note 10-10 should be read as ten raise to minus ten and 10 10 as ten raise to ten) *

1 point

10-19

10 36

10 19

10-36

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