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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) × 10^{5}?

(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^{-2}J.

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: 10^{25}m.

True/False Type Questions

Question 1.

The density of water is 1000 kgm^{-3}

## Answer

Answer: True

Question 2.

10^{6} 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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