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#### Centum one mark questions with answer key Chapter - 1

11th Standard

Reg.No. :
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Physics

Time : 00:30:00 Hrs
Total Marks : 30
Part A
30 x 1 = 30
1. 1 pa is equal to

(a)

1Nm-2

(b)

1Jm-2

(c)

1Nm-1

(d)

1Jm-1

2. Which doesn't has the same unit as others?

(a)

J - sec

(b)

watt - sec

(c)

kwh

(d)

eV

3. Inertia has the same unit as

(a)

weight

(b)

force

(c)

mass

(d)

acceleration

4. Which of the following pairs of quantities and their units is a proper match?

(a)

Electric charge - C

(b)

Pressure - Pa

(c)

Power - JS-1

(d)

Moment of inertia - Kg m-2

5. Which relation is wrong?

(a)

1 fermi = 10-14 m

(b)

r nanometer = 10-9 m

(c)

1 AU = 1.496 X 1011 m

(d)

1 parsec = 3.26 light year

6. 1 CSL is the largest practical unit of:

(a)

time

(b)

mass

(c)

temperature

(d)

(a)

1.745 x 10-2

(b)

4.85 X 10-6

(c)

1.91 X 10-4

(d)

2.91 x 10-4

8. Scientist preferred platinum - Iridium alloy cylinder for making prototype of 1 kg standard of mass because it is unaffected by:

(a)

temperature

(b)

pressure

(c)

time

(d)

amount of substance

9. Least count of screw gauge:

(a)

0.01 mm

(b)

0.01 cm

(c)

0.1 mm

(d)

1cm

10. Least count of metre scale:

(a)

1 cm

(b)

0.1 cm

(c)

1mm

(d)

0.1 mm

11. Sonar emits which of the following waves?

(a)

(b)

light

(c)

microwave

(d)

ultrasound

12. The ratio of the dimension of planck constant and that of moment of inertia is the dimension of _____________

(a)

time

(b)

frequency

(c)

velocity

(d)

angular momentum

13. The angle subtended by a coin of radius 1 em held at a distance of 80 em from your eyes is

(a)

1.430

(b)

0.720

(c)

0.01250

(d)

0.0250

14. Light year is used to measure:

(a)

distance between two stars

(b)

distance between two cities

(c)

distance between two electron

(d)

distance between two atoms

15. The density of a liquid in CGS system is 0.625 g / cm3. What is its magnitude in SI system?

(a)

625 kg/m3

(b)

0.0625 kg/m3

(c)

0.625 kg/in3

(d)

O.00625 kg/m3

16. The unit of force is 1KN, the length is 1km and time 100s, what will be the unit of mass?

(a)

1000 kg

(b)

1 kg

(c)

100 kg

(d)

10,000 kg

17. Which of the following is not the unit of time?

(a)

light year

(b)

astronomical unit

(c)

parsec

(d)

all the above

18. The respective number of significant figures for the number 13.013, 0.0003 and 9.1 x 10-3 are respectively:

(a)

5, 1,2

(b)

5,4,5

(c)

5, 5,2

(d)

5, 1,3

19. A student measured the length of a wire and wrote it as 2.50 cm which instrument did he/she use to measure it?

(a)

a screw gauge having 50 divisions in the circular scale and pitch as 1mm

(b)

a meter scale

(c)

a vernier caliper where the 10 division in vernier matches with a division in main scale

(d)

a screw gauge having 100 division in the circular scale and pitch as 1 mm.

20. If the error in the measurement of radius of a sphere is 3% then the error in the measurement of volume of the sphere will be:

(a)

4%

(b)

6%

(c)

2%

(d)

9%

21. The diameter of the steel ball is measured using a vernier calipers which has divisions of O.lcm on its main scale and 10 division of its vernier scale match 9 division on the main scale. Three such measurements for a ball are as follows.

 S.No MS (cm) VS (divisions) 1 0.5 8 2 0.5 4 3 0.5 6

If the zero error is - 0.03 em, then mean corrected diameter is__________________ cm.

(a)

0.56

(b)

0.53

(c)

0.59

(d)

0.52

22. If A = 2.331cm and C = 2.1cm, then A + C = ______________cm

(a)

4.4

(b)

4

(c)

4.43

(d)

4.431

23. The least count of stop watch is 0.5s. The time of 40 oscillation of the pendulum is found to be 40s. The percentage error in the measurement of time period is __________________%.

(a)

0.75

(b)

0.5

(c)

1.25

(d)

0.25

24. A student has measured the length of a wire equal to 0.04580m. The value of length has the number of significant figure equal to:

(a)

4

(b)

5

(c)

6

(d)

3

25. The sum of the numbers 436.32, 227.2 and 0.301 in appropriate significant figure is:

(a)

663.82

(b)

663.8

(c)

664

(d)

6663.82

26. Random error can be eliminated by

(a)

careful observation

(b)

eliminating the cause

(c)

taking mean

(d)

measuring with more than one instrument

27. Gross error can be eliminated by:

(a)

(b)

eliminating the cause

(c)

taking mean

(d)

measuring with more than one instrument

28. High precision instruments are used to eliminate:

(a)

personal error

(b)

random error

(c)

chance error

(d)

least count error

29. Which of the following is the most accurate?

(a)

200.0 m

(b)

20 X 101m

(c)

2 x 102 m

(d)

30. Round off to the number 12.653 upto 3 digits

(a)

12.5

(b)

12.0

(c)

12.7

(d)

12.6