AS & A Level Physics 1.1 Physical quantities – Exam Style Questions Paper 1

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Question

What could not be a measurement of a physical quantity?

A      10 K        B    11 \(J\, N^{-1}m^{-1}\)           C  17 \(Pa\, m^{3}N^{-1}\)            D    25 \(T\, m\)

Answer/Explanation

Ans:     B

The measurement of a physical quantity must have a value and a unit. 

(A) In this option A, the value is 10 and the unit is K, hence it can represent a measurement of a physical quantity.

(B) In this option, the value is 11 and the unit is given as, J/(Nm), since Nm is also Joules, therefore the physical quantity is unit less. Hence it does not represent a measurement of a physical quantity.

(C) In this option, the value is 17 and the unit is \frac{Pa*m}{N/m^2} = \frac{Pa*m}{Pa} = m , therefore it represents a measurement of a physical quantity.

(D) In this option, the value is 25 and the unit is Tm, hence the measurement has a value and a unit therefore it represents a physical quantity.

Hence the option (B) is correct.

Question

  What is essential when recording a measurement of a physical quantity?
     A the measurement has an SI unit
     B the measurement has a unit and a number
     C the measurement has a unit given as a base unit
     D the measurement is from an analogue scale

Answer/Explanation

Ans :B

The measurement should have a value as a number and a unit.

(A) The measurement must also have a number and not just unit, hence the option is not correct.

(B) The measurement has a unit and a number therefore it can represent a physical quantity and the option is correct.

(C) If the measurement has only unit it can not be a measurement of a physical quantity, hence the option is incorrect.

(D) The measurement must also have a unit, therefore the option is incorrect.

 

Question

 What is a reasonable estimate of the volume of an adult person?

          A 0.10 m³      B 0.50 m³      C 1.0 m³       D 2.0 m³

Answer/Explanation

Ans: A

The average height of a person is 1.8 m,  the width is 0.6 m and the thickness is 0.1 m, therefore the volume will be given as ,

Volume = lwh = 1.8\times 0.6\times 0.1 = 0.108 m^3 \approx 0.1m^3

 

Question

The table shows some measurable quantities.  Which row gives the correct order of magnitude of the measurable quantity in the stated unit?

(A) The mass of a coin is approximately 5 grams hence it is much greater than 10^{-4} kg , hence the option is incorrect.

(B) The thickness of a paper is in millimeter hence it is less than 10^{-2} m therefore the option is incorrect.

(C) The mass of an apple is approximately 125 grams therefore the weight of the apple is

W = 0.100\times 9.8 = 0.98 N \approx 1 N

Hence the option (C) is correct.

 

Answer/Explanation

Ans:C

Question

Which quantity is a physical quantity?
A atomic number
B efficiency
C number density of charge carriers
D strain

Answer/Explanation

Ans: C

(A) The atomic number is not a physical quantity because it does not have a unit. Atomic number is a chemical property. Hence the option is incorrect.

(B) The efficiency does not have a unit, hence it is not a physical quantity.

(C) The number density has a unit of N/m^3 therefore it is a physical quantity.

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