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Units and Measurements Class 11 MCQs Questions with Answers
Multiple Type Choice Questions
Question 1.
Which of the following is not the name of physical quantity?
(a) Kilogram
(b) Density
(c) Impulse
(d) Energy
Answer
Answer: (a) Kilogram
Question 2.
The weight of a body is 12g. This statement is not correct because
(a) The correct symbol for the unit of weight has not been used.
(b) The correct symbol for gram is gm.
(c) The weight should be expressed in kg.
(d) Of some reason other than those given above.
Answer
Answer: (a) The correct symbol for the unit of weight has not been used.
Question 3.
The density of a liquid is 13.6 g cm-3. Its value ip S.I. is
(a) 13.6 kgm-3
(b) 136 kgm-3
(c) 13600 kgm-3
(d) 1360 kgm-3
Answer
Answer: (a) 13.6 kgm-3
Question 4.
If the unit of force and length are doubled, the unit of energy will be
(a) 1/2 times
(b) 2 times
(c) 4 times
(d) 1/4 times
Answer
Answer: (c) 4 times
Question 5.
Which of the following have the same dimensions as \(\frac { v^2 }{ r }\) Where v is the speed of the particle describing a circular path of radius r.
(a) Force
(b) Impulse
(c) Acceleration
(d) Momentum
Answer
Answer: (c) Acceleration
Question 6.
Which of the following have the same dimensions as Plank’s constant?
(a) Moment of momentum
(b) Moment of fierce
(c) Momentum/distance
(d) Force/distance
Answer
Answer: (a) Moment of momentum
Question 7.
Which of the following is a dimensionless quantity, even when the measured quantity is not dimensionless?
(a) absolute error
(b) Gross error
(c) Relative error
(d) experimental error
Answer
Answer: (c) Relative error
Question 8.
The zero error belongs to the category of:
(a) constant error
(b) personal error
(c) accidental error
(d) instrumental error
Answer
Answer: (d) instrumental error
Question 9.
The least count of a stop watch is 0.1s. The time of 20 oscillations of the pendulum is found to be 20s. The percentage error in the time period is
(a) 0.25%
(b) 0.75%
(c) 0.50%
(d) 1.0%
Answer
Answer: (c) 0.50%
Question 10.
The value of 0.98 – 0.989 with regard to the significant digit will be:
(a) 0.001
(b) 0.010 × 10-1
(c) 0.01 × 10-1
(d) None of these
Answer
Answer: (c) 0.01 × 10-1
Question 11.
What is the number of significant figures in (3.20 + 4.80) × 105?
(a) 2
(b) 3
(c) 4
(d) 5
Answer
Answer: (b) 3
Question 12.
Which of the following numerical values has three significant figures?
(a) 5.055
(b) 0.050
(c) 50.50
(d) 0.500
Answer
Answer: (d) 0.500
Question 13.
Which of the following is not the name of a physical quantity?
(a) Kilogram
(6) Density
(c) energy
(d) Impulse
Answer
Answer: (a) Kilogram
Question 14.
A laser signal is sent towards the moon with a speed of light C and returns after a time f seconds. The distance of the moon from the observer is
(a) ct
(b) ct/2
(c) ct-2
(d) ct-1
Answer
Answer: (b) ct/2
Question 15.
The volume of a cube in m3 is numerically equal to its surface area in m². The volume of the cube is
(a) 64m³
(b) 1000m³
(c) 216m³
(d) 512m³
Answer
Answer: (c) 216m³
Question 16.
The weight of a body is 12g. This statement is not correct because:
(а) the correct symbol for the unit of weight has not been used
(b) the correct symbol for gram is gm.
(c) the weight should be expressed in kg.
(d) None of the above
Answer
Answer: (а) the correct symbol for the unit of weight has not been used
Question 17.
Give that the displacement of a particle is given by x = A² sin² kt, where t denotes the time. The unit of k is
(a) radian
(b) metre
(c) hertz
(d) second
Answer
Answer: (c) hertz
Question 18.
Which of the following is the unit of molar gas constant?
(a) JK-1 mol-1
(b) J
(c) JK-1
(d) J mol-1
Answer
Answer: (a) JK-1 mol-1
Question 19.
The dimensional formula for angular momentum is same as that for:
(a) torque
(b) Plank’s constant
(c) gravitational constant
(d) impulse
Answer
Answer: (b) Plank’s constant
Question 20.
Which of the following physical quantity is dimensionless?
(a) angle
(b) specific gravity
(c) strain
(d) all of these
Answer
Answer: (d) all of these
Fill in the blanks
Question 1.
………………. is used to find the distance of a hill indirectly.
Answer
Answer: Reflection or ecfio method.
Question 2.
The angle made by the tw o diametrically opposite ends of the moon at a point on Earth is called ………………. and its value for moon is about ……………….
Answer
Answer: angular diameter of the moon, 0.5.
Question 3.
The order of magnitude of the mass in kg of man is ………………. electron is ………………. and that of Earth is ……………….
Answer
Answer: 2, -30, 25.
Question 4.
Spring balance works on the ………………. law.
Answer
Answer: Hook’s.
Question 5.
A ………………. clock is the most accurate one.
Answer
Answer: Cesium.
Question 6.
The ……………….. and ………………. masses of an object do BOS differ from each other.
Answer
Answer: Inertial and gravitational.
Question 7.
………………. is the dimensional formula of gravitational field strength.
Answer
Answer: It M° L T-2J.
Question 8.
The relative accuracy of measurement by a screw gauge can be increased by ……………….
Answer
Answer: increasing the number of divisions on the circular scale.
Question 9.
The relative error decreases on increasing the number of divisions on the circular scale because least count ………………. due to it.
Answer
Answer: decreases.
Question 10.
Mean value – measured value gives the ……………….
Answer
Answer: absolute error.
Question 11.
The estimated radius of the universe is of the order of ……………….
Answer
Answer: 1025m.
True/False Type Questions
Question 1.
The density of water is 1000 kgm-3
Answer
Answer: True
Question 2.
106 km is not expressed as M km as the use of double prefixes is not allowed.
Answer
Answer: True
Question 3.
The absolute error in each measurement is equal to the least count of the measuring instrument.
Answer
Answer: True
Question 4.
The pure numbers have no dimensions Le. they are dimensionless.
Answer
Answer: True
Question 5.
A physical quantity may be dimensionless but it may have units.
Answer
Answer: True
Question 6.
Frequency and velocity gradient have the same unit.
Answer
Answer: True
Question 7.
Impulse and energy gradient have the Same unit.
Answer
Answer: False
Question 8.
Surface tension and force gradient have the same unit.
Answer
Answer: True
Question 9.
Potential gradient and electric field have the same unit.
Answer
Answer: True
Question 10.
Pascal metre is the S*I. unit of energy.
Answer
Answer: False
Question 11.
Displacement gradient have the units of length.
Answer
Answer: False
Question 12.
All Quantities may be represented dimensionally in terms of the basic quantities.
Answer
Answer: True
Question 13.
A basic quantity cannot be represented dimensionally in terms of the other basic or fundamental quantities.
Answer
Answer: True.
Question 14.
The dimension of a derived quantity is never zero in any fundamental quantity
Answer
Answer: False
Question 15.
The dimension of a fundamental quantity in other fundamental quantities is always zero.
Answer
Answer: True.
Question 16.
A dimensionally correct equation may be correct
Answer
Answer: True
Question 17.
A dimensionally incorrect equation may be incorrect
Answer
Answer: True
Question 18.
A dimensionally correct equation may be incorrect
Answer
Answer: True
Question 19.
A dimensionally incorrect equation may be correct
Answer
Answer: False
Question 20.
A quantity can have dimensions but still have no units.
Answer
Answer: True.
Question 21.
A quantity cap have units but still be dimensionless. Give an example.
Answer
Answer: True
Question 22.
Gravitational constant (G), Plank’s constant (h) and Boltzmann constant (k) are constants and have dimensions.
Answer
Answer: True.
Question 23.
Dimensional formula and dimensional equation are different.
Answer
Answer: True.
Question 24.
Nm-2 is the unit of force.
Answer
Answer: False.
Match Type Questions
| Column I | Column II |
| (1) Stress or thrust | (a) force |
| (2) Relative density | (b) zero error |
| (3) Dimensional formula for the time rate of change of impulse | (c) [M° L²T-2] |
| (4) Unit of distance | (d) dimensionless quantity |
| (5) Dimensional formula for angular momentum | (e) Pressure |
| (6) Instrumental error | (f) light year |
| (7) \(\frac { absolute error }{ True value }\) × 100 | (g) never has a non zero dimension |
| (8) Unitless quantity | (h) Percentage error |
| (9) Distance between Earth and star | (i) Plank’s constant |
| (10) Latent heat | (j) Angstrom |
Answer
Answer:
| Column I | Column II |
| (1) Stress or thrust | (e) Pressure |
| (2) Relative density | (d) dimensionless quantity |
| (3) Dimensional formula for the time rate of change of impulse | (a) force |
| (4) Unit of distance | (j) Angstrom |
| (5) Dimensional formula for angular momentum | (i) Plank’s constant |
| (6) Instrumental error | (b) zero error |
| (7) \(\frac { absolute error }{ True value }\) × 100 | (h) Percentage error |
| (8) Unitless quantity | (g) never has a non zero dimension |
| (9) Distance between Earth and star | (f) light year |
| (10) Latent heat | (c) [M° L²T-2] |
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