Chapter 1 with Answers
1.
SI units of solid angle is
(a)
radian (b)
revolution
(c) degree (d)
steradian
2.
Which one of the followings
is not the SI unit of length?
(a)
angstrom (b) micron
(c) radian (d)
parsec
3.
Which one of the followings
is not the SI unit?
(a)
kg (b) mol
(c) °C (d)
cd
4.
Which one of the followings
is not the fundamental SI unit?
(a)
kelvin (b)
ampere
(c) poise (d) metre
5.
Candela is the SI unit of
(a)
charge (b)
luminous intensity
(c)
power (d)
refractive index
6.
1.2 kgm-3 when changed to
gcm-3 reads
(a)
1.2x10-1 (b) 1.2x10-2
(c) 1.2x10-3 (d) 1.2x10-4`
7.
Radius of a proton is equal
to
(a)
1.2x10-13 cm (b)
1.2x10-13 m
(c)
1.2x10-14 m (d) 1.2x10-10 m
8.
Which one of the followings
represents the longest length?
(a)
1.24x104 mm (b)
1.24x104 m
(c)
1.24x102 km (d) 1.24x103 dm
9.
Steradian is the angle
subtended in
(a)
two dimensions
(b)
three dimensions
(c)
both in two and three
dimensions
(d)
none of these
10. The absolute uncertainty in the measurement 15.4 cm is
(a)
0.1 cm (b)
0.01 cm
(c) 0.05 cm (d)
0.5 cm
11. The fractional uncertainty in a measurement is defined as
(a)
measured value – zero
error
(b) measured value/error
(c)
error x measured value
(d)
measured value
12. The fractional uncertainty in measurement 15.4 cm is
(a).
0.006 (b)
0.0006
(c) 0.003 (d)
none of these
13. Which instrument is suitable for measuring the length of a metal
bar about 10 cm long?
(a)
Screw gauge (b)
Vernier Calliper
(c)
Metre rod (d)
External jaws of a calliper
14. A metre rod is used to measure a length. The correct order of
accuracy of the instrument is
(a)
1 cm (b) 0.05 cm
(c) 0.01 cm (d)
0.1 cm
15. A micrometer screw gauge is used to measure the diameter of a
glass rod. The correct order of accuracy of the instrument is
(a)
1 mm (b)
0.1 mm
(c) 0.01 mm (d) 0.0001mm
16. Which one of the followings is not suitable for the measurement
of time?
(a)
simple pendulum (b) pulse rate
(c)
ticker timer (d) vibrating mass-spring system
17. A simple pendulum can be used as a clock because
(a)
its time period is 1 s
(b)
its time period is
constant
(c)
its period of oscillation
is same every where
(d)
it does not stop
oscillating
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18. One giga means
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(a)
109
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(b)
10-9
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(c) 10-12
19. One femto equals
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(d) 1012
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(a)
1015
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(b)
1012
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(c) 10-12
20. One micrometer equals
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(d) 10-15
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(a)
10-3 m
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(b)
10-6 m
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(c) 10-5 m
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(d) 106 m
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21.
An error of observation
arising out of the negligence on the part of the person is called
(a)
random error (b) systematic error
(c)
personal error (d) common error
22.
Use of faulty apparatus
introduces an error called
(a)
experimental error (b) designing error
(c)
random error (d) systematic error
23.
Random error can be
corrected by
(a)
taking an observation
carefully
(b)
using a precise instrument
(c)
taking several
observations
(d)
calibrating the instrument
24.
Causes of systematic error
in an instrument are
(a)
unknown (b)
known
(c) arbitrary (d) none of these
25.
Significant figures in a
measured value indicate
(a)
the reading on an
instrument
(b)
doubtful numbers
(c)
quantity which is
reasonably reliable
(d)
accurate numbers
26.
The number of significant
figures in the value 0.09810 are
(a)
4 (b)
3
(c) 6 (d)
5
27.
The number of significant
figures in the value 1.90
10-31
are
(a)
34 (b)
28
(c) 3 (d)
2
28.
The dimensions of weight
are equal to the dimensions of
(a)
weight density (b)
mass density
(c) pressure (d) force
29.
When rounded off to three
significant figures, the value
6.735 should be written as
(a)
6.73 (b)6.70
(c) 6.74 (d) none of these
30.
9.845 is to be rounded off
to three significant figures. The value should be written as
(a)
9.84 (b)
9.85
(c) 9.80 (d) none of these
32.
Given F = t + bt dimensions of a and b are respectively
(a), [MLT-1] and [MLT-4] (b) [LT-1] and [T-2]
(c)
[T] and [T-2] (d) [LT-2] and [T-2]
33.
The dimensions of angular
displacement are
(a)
[L] (b)
[LT-1]
(c) [L2] (d) [L0]
34.
Which of the following
quantities is not dimensionless?
(a)
angle (b)
stress
(c)
Young's modulus (d)
relative density
35.
The dimensional formula for
energy per unit area per second is
(a)
[MT-1] (b)
[MLT-1]
(c) [ML2T-1] (d) [MT-3]
36.
Use of dimensional analysis
involves in
(a)
finding the units of a
quantity
(b)
deriving a mathematical
formula
(c)
checking the correctness of
an equation
(d)
all of these
37.
Numbers carry
(a)
no dimensions (b)
arbitrary dimensions
(c)
dimensions but no units (d) all of these
38.
Only those terms can be
added or subtracted which have
(a)
different dimensions (b) same
dimensions
(c)
no dimensions (d) none of these
40. The travel time of light from Earth to
the moon (average 8 distance = 3.86 x 10 m) is about
(a) 8 seconds (b) 1.20 seconds
(c)
1.20 minutes (d) 12 seconds
Key to Test Chapter 1
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1
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d
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21
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a
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2
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c
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22
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d
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3
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c
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23
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c
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4
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c
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24
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b
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5
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b
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25
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c
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6
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c
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26
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a
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7
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c
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27
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c
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8
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c
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28
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d
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9
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b
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29
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c
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10
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a
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30
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a
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11
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d
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31
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d
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12
|
a
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32
|
a
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13
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b
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33
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d
|
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14
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d
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34
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b
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15
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c
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35
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d
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16
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b
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36
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d
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17
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b
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37
|
a
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18
|
a
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38
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b
|
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19
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d
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39
|
b
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20
|
b
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40
|
b
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