Units And Measurements CBSE Questions & Answers

Units And Measurements

This is Physics Class 11 Units and Measurements CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
The number of significant digits in 2,076 is
  • A
    3
  • B
    2
  • C
    4.0
    Correct
  • D
    5
2
The number of significant digits in 0.0004 is
  • A
    3
  • B
    1.0
    Correct
  • C
    4
  • D
    2
3
The number of significant digits in 48,923 is
  • A
    3
  • B
    4
  • C
    5.0
    Correct
  • D
    2
4
The number of significant digits in 3.967 is
  • A
    1
  • B
    3
  • C
    5
  • D
    4.0
    Correct
5
The number of significant digits in 900.06 is
  • A
    1
  • B
    5.0
    Correct
  • C
    3
  • D
    4
6
The number of significant digits in 8.1000 is
  • A
    5.0
    Correct
  • B
    1
  • C
    3
  • D
    4
7
The number of significant digits in 501.040 is
  • A
    3
  • B
    4
  • C
    6.0
    Correct
  • D
    5
8
The number of significant digits in 3,000,000 is
  • A
    1.0
    Correct
  • B
    4
  • C
    5
  • D
    3
9
The number of significant digits in 10.0 is
  • A
    5
  • B
    1
  • C
    3.0
    Correct
  • D
    4
10
Population of a town is reported as 157,900 . Which of the following statements correct?
  • A
    the population is 157900\( \pm \)100
  • B
    the population is 157900\( \pm \)20
  • C
    the population is 157900\( \pm \)25
  • D
    the population is 157900\( \pm \)50
    Correct
11
Population of a town is reported as 158000 . Which of the following statements correct?
  • A
    the population is 158000\( \pm \)400
  • B
    the population is 158000\( \pm \)500
    Correct
  • C
    the population is 158000\( \pm \)300
  • D
    the population is 158000\( \pm \)250
12
An object has a length of 0.42 cm. Which of the following statements correct?
  • A
    the uncertainty in the length is about 1\(\% \)
  • B
    the uncertainty in the length is about 3\(\% \)
  • C
    the uncertainty in the length is about 2\(\% \)
    Correct
  • D
    the uncertainty in the length is about 4\(\% \)
13
The result of rounding off 34.216 to 3 digits is
  • A
    34.2
    Correct
  • B
    342
  • C
    3.42
  • D
    34.22
14
Dimensional analysis can be used to
  • A
    check the order of an equation
  • B
    deducing relations among the physical quantities
    Correct
  • C
    check the validity of an equation
  • D
    None of these
15
An object has a length of 0.42 cm. Which of the following statements correct?
  • A
    the uncertainty in the length is 0.05
  • B
    the uncertainty in the length is \( \pm \)0.01
  • C
    the uncertainty in the length is 0.01
    Correct
  • D
    the uncertainty in the length is about 4\(\% \)