02.Units and Measurement

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Created on By m anwar
units and measurement test by m anwar

Units And Measurement Test

Basic Level

1 / 30

A new unit of length is chosen such that the speed of light in 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 ?

(a) 500    (b) 450   (c) 600    (d) 550

 

2 / 30

The resistance R = V/I where V = (100 ± 5) volt and I = (10 ± 0.2)  ampere. Find the percentage error in R.

(a) 5%    (b) 2%    (c) 7%     (d) 3%

3 / 30

The temperatures of two bodies measured by a thermometer are

t1 = 20  ± 0.5   and   t2 = 50  ± 0.5   Calculate the temperature difference  .

(a) 30                       (b) 30  ± 1

(c) 30  ± 0.5           (d) 70  ± 1

4 / 30

We measure the period of oscillation of a simple pendulum. In successive measurements, the readings

turn out to be 2.63  s , 2.56  s , 2.42  s , 2.71   s  and  2.80  s  . Calculate the percentage error.

(a)  11%  (b)  8%  (c)  0.11%  (d) 4%

5 / 30

Which device have minimum least count

(a) metre scale     (b) vernier calliper

(c) screw gauge   (d)  foot scale

6 / 30

46.7000  m   =

(a)  4670  cm                  (b)  46700 cm

(c) 46.7 x 102 cm           (d)  4670.00 cm

7 / 30

Which of the following is correct  ?

(a)  Accuracy  ∝   1/error

(b)  precision  ∝    1/least count

(c)  Number    ∝    1/unit

(d)   all

8 / 30

Parsec is a unit of

(a)   length                                     (b)  intensity

(c) speed                                        (d)  time

9 / 30

What will be the output if charge of electron is divided by its mass ?

(a)  1.8 × 1011                 (b)  1.67 × 1012                                            

(c)  1.2 × 1011                 (d)  1.8 × 1012

10 / 30

The dimension of Potential energy is same as

(a)  force                                    (b)  pressure

(c)  work                                    (d)  momentum

11 / 30

Name a physical quantity which have unit but no dimension .

(a)     Angle                    (b) universal gas constant

(c)  refractive index    (d)   density

12 / 30

If a student measures a rod  5 times and each measurements are   6.02 , 6.01 , 6.05  ,  5.99 ,  5.98   then what is the value of average error ?

(a)  0.01                      (b)  0.02

(c)  0.03                      (d)  6

13 / 30

If   F  =  av2  +  (ab)/x   then what is the dimension of   a    and    ?

If  F is force , v is speed and x is distance.

(a)  a  =  [ ML-1 ]       &      b  =  [  L3T-2 ]

(b)  a  =  [ ML-2 ]       &      b  =  [  L3T-2 ]

(c)  a  =  [ ML-1 ]       &      b  =  [  L3T-1 ]

(d)  a  =  [ ML-1 ]       &      b  =  [  L4T-2 ]

14 / 30

If the speed of a moving object is doubled then by how much %

its kinetic energy get increased?

(a) 100 %                                  (b) 200 %

(c) 300 %                                  (d) 125 %

15 / 30

If   F  =  av2  +  b/x   then what is the dimension  of   a    and    b?   If  F is force , v is speed and x

is distance.

(a)  a  =  [ ML-1 ]       &    b  =  [ ML-2T-2 ]

(b)  a  =  [ ML-2 ]       &    b  =  [ ML2T-3 ]

(c)  a  =  [ ML-1 ]       &    b  =  [ ML2T-2 ]

(d)  a  =  [ ML-2 ]       &    b  =  [ MLT-3 ]

16 / 30

1 N  =  ________________ dyne

(a)102                                                            (b)103                  

(c)104                                            (d)105

17 / 30

Round off up to 3 significant figure to 2.455

(a)   2.45                                     (b)   2.450

(c)   0.245                                    (d)  2.46

18 / 30

No. of significant figure in  0.0020030  is

(a)   3                                          (b)   4

(c)   5                                           (d)   6

19 / 30

If   y = ebt, where    is time , then what is the

dimension of  b  ?

(a)  [ MT-1 ]                                    (b)  [ T-1 ]

(c)  [L T-1 ]                                     (d)  [ML T-1 ]

20 / 30

Convert   80 g/cm3  in S.I unit

(a)     8 ×103 kg/m3             (b)     8 ×102 kg/m3

(c)     0.0008 kg/m3            (d)     8 ×104 kg/m3

21 / 30

The dimension of universal gravitational constant    G    is

(a)   [ M-1  L3  T-2 ]      (b)   [ M-1  L2  T-2 ]

(c)   [ M-1  L3  T-3 ]      (d)   [ M-2  L3  T-2 ]

22 / 30

1  Nm2/kg2    =  _________  Dyne cm2/gram2

(a)  10   (b)   100   (c)  1000  (d)  10000

23 / 30

100  gram/cm2    =   __________  kg/m2

(a)  10000   (b)  1000     (c)  100    (d) 10

24 / 30

Find the dimension of     k    , in the equation     w = kx2

where    x = distance  and  w = work

(a)  [MLT-2]    (b)  [ML2T-2]

(c)  [MT-2]      (d)  [ML-2]

25 / 30

The pair of quantities having same dimensions is

(a) Displacement, velocity        (b) Time, frequency
(c) Wavelength, focal length   (d) Force, acceleration

26 / 30

In the measured value 10.1000 g, the number of
zeroes which are significant is/are

(a)   one        (b)    two

(c)    three    (d)  four

27 / 30

Which is a supplementary unit?

(a) radian          (b) steradian

(c) candela       (d)  a    and b    both

28 / 30

90 km/h   =

(a)  25 m/s  (b)  20 m/s

(c)  9 m/s     (d)  30 m/s

29 / 30

1 joul  = ______________erg.

(a)  108      (b)  107          (c)  1011              (d)  1012

30 / 30

Speed of light in S.I. system is 3 x 108 m/s. In a new system, unit of length is    a  km  and unit of
time is   b  second. Then speed of light in new system of unit is

(a)   105 b/a        (b)  105 b/3a

(c)  105 x 3a/b    (d)  105 x 3b/a

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Units and Measurements NEET Questions Pdf

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