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Free download in PDF Unit and Measurement Objective Type Questions & Answers for competitive exams. These Unit and Measurement Quiz Questions with Answers are useful for competitive exams like IIT, JEE, NEET, AIIMS, JIPMER etc.
(21)
The surface tension of a liquid is 70 dyne/cm. In MKS system its value is?
[A]
70 N/m
[B]
7 ✕ 10-2 N/m
[C]
7 ✕ 102 N/m
[D]
7 ✕ 103 N/m
(22)
One watt hour contains how many joules?
[A]
3.6 ✕ 108 J
[B]
3.6 ✕ 102 J
[C]
3.6 ✕ 103 J
[D]
10-3 J
(23)
Electron volt is a unit of
[A]
Charge
[B]
Potential difference
[C]
Energy
[D]
Magnetic Force
(24)
What is the unit for measuring the amplitude of a sound?
[A]
Decibel
[B]
Coulomb
[C]
Hum
[D]
Cycles
(25)
The sum of the numbers 436.32, 227.2 and 0.301 in appropriate significant figures is
[A]
663.821
[B]
664
[C]
663.8
[D]
663.82
(26)
The numbers 2.745 and 2.735 on rounding off to 3 significant figures will give
[A]
2.75 and 2.74
[B]
2.74 and 2.73
[C]
2.75 and 2.73
[D]
2.74 and 2.74
(27)
You measure two quantities as A = 1.0 m ± 0.2 m, B = 2.0 m ± 0.2 m. We should report correct value for √AB as:
[A]
1.4 m ± 0.4 m
[B]
1.41m ± 0.15 m
[C]
1.4m ± 0.3 m
[D]
1.4m ± 0.2 m
(28)
Young’s modulus of steel is 1.9 × 1011 N/m2. When expr essed in CGS units of dynes/cm2, it will be equal to (1N = 105 dyne, 1m2 = 104 cm2)
[A]
1.9 × 1010
[B]
1.9 × 1011
[C]
1.9 × 1012
[D]
1.9 × 1013
(29)
The number of significant figures in 600 m is
(30)
The mean length of an object is 5 cm. Which of the following measurements is most accurate?
[A]
4.9 cm
[B]
4.805 cm
[C]
5.25 cm
[D]
5.4 cm
31
Which of the following pairs of physical quantities does not have same dimensional formula?
[A]
Work and torque.
[B]
Angular momentum and Planck’s constant
[C]
Tension and surface tension
[D]
Impulse and linear momentum
Answer: Tension and surface tension
32
The equation of state of some gases can be expressed as Vander wal equation i.e.
(P + a/v2)(V – b) = RT
Where P is the pressure, V is the volume, T is the absolute temperature and a, b, R are
constants. The dimensions of ‘a’ are:
[A]
[M1L1T-1]
[B]
[M1L-5T1]
[C]
[M2L5T-1]
[D]
[M1L5T-2]
33
Which of the following pairs has the same dimensions?
[A]
Specific Heat and Latent Heat
[B]
Impulse and Momentum
[C]
Surface Tension and Force
[D]
Moment of Inertia and Torque
Answer: Impulse and Momentum
34
The length and breadth of a rectangular sheet are 16.2 cm and 10.1cm, respectively. The area of the sheet in appropriate significant figures and error is
[A]
164 ± 3 cm2
[B]
163.62 ± 2.6 cm2
[C]
163.6 ± 2.6 cm2
[D]
163.62 ± 3 cm2
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