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Mechanics (Part –1)

📆 December 2, 2024

Total Questions: 50

31. Which of the following physical quantities is a scalar quantity? [S.S.C. Online CHSL (T-I) 7.01.2017 (Shift-I)]

Correct Answer: (c) Young's Modulus
Solution:The quantities which have only magnitude not direction are called scalar quantities.

For example,

  • mass,
  • density,
  • electric current,
  • speed,
  • distance,
  • volume,
  • pressure,
  • temperature,
  • Young's modulus, etc.

32. Physical quantities, which have ____ only and no _____ , are called scalar quantities. [S.S.C. Online CHSL (T-I) 16.01.2017 (Shift-I)]

Correct Answer: (b) magnitude, direction
Solution:The quantities which have only magnitude not direction are called scalar quantities.

For example,

  • mass,
  • density,
  • electric current,
  • speed,
  • distance,
  • volume,
  • pressure,
  • temperature,
  • Young's modulus, etc.

33. Which of the following is a scalar quantity? [C.P.O. S.I. 7.06.2016 (Shift-I)]

Correct Answer: (b) Pressure
Solution:The quantities which have only magnitude and not direction are called scalar quantities.

For example,

  • mass, density, electric current, speed, distance, volume, pressure, temperature, Young's modulus, etc.

34. Work done on a body is _________ . [S.S.C. Online MTS (T-I) 21.09.2017 (Shift-II)]

Correct Answer: (b) Only scalar quantity
Solution:Work is a scalar quantity i e. work has only magnitude no direction.

35. What is the unit of work done? [S.S.C. Online CGL (T-I) 01.12.2022 (Shift-I)]

Correct Answer: (d) Joule
Solution:The SI unit of work is Joule (J).
  • Joule is the work done by the force of one newton causing a displacement of one meter.
  • Sometimes, newton metre (N-m) is also used for measuring work.

36. Which of the following physical quantities has same SI unit as that of work? [S.S.C. Online MTS (T-I) 07.07.2022 (Shift-III)]

Correct Answer: (d) Energy
Solution:The SI unit of work is joule (J), which is defined as the amount of energy transferred when a force of 1 Newton is applied over a distance of 1 meter in the direction of the force.

The physical quantity that has the same SI unit as work is "energy", as work is a measure of the energy expended or transferred during a process.

Thus, the SI unit of energy is also joule (J).

37. Formula for distance is_____. [S.S.C. Online CHSL (T-I) 10.01.2017 (Shift-II)]

Correct Answer: (a) speed × time
Solution:The distance covered by a moving body is given as the product of the speed of the body and the time taken by the body to complete its journey.

Distance = Speed × Time

38. Which among the following is not a unit of distance? [S.S.C. Online CHSL (T-I) 20.01.2017 (Shift-I)]

Correct Answer: (b) Longsec
Solution:The light-year, the astronomical unit, and the parsec are units of distance, while the longsee unit is not of any quantity.

39. The Sl unit of speed is____. [S.S.C. Online CGL (T-I) 13.12.2022 (Shift-I)]

Correct Answer: (a) m/s
Solution:For any body in motion, the formula for the speed of the body is given as:

s=d/t

Where,
s= speed of the body
d= distance covered by the body during its journey
t= time taken by the body to complete its journey

There fore SI unit of Speed is m/s

40. What is the basic unit of speed? [S.S.C. Online MTS (T-I) 12.10.2017 (Shift-III)]

Correct Answer: (d) Metre/Second
Solution:For any body in motion, the formula for the speed of the body is given as:

s=d/t

Where,
s= speed of the body
d= distance covered by the body during its journey
t= time taken by the body to complete its journey

There fore SI unit of Speed is m/s

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