Mechanics (Physics) (Part-1)

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,
 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