Mechanics (Physics) (Part-1)

Total Questions: 50

41. The SI unit of acceleration is____. [S.S.C. Online CHSL (T-I) 7.03.2018 (Shift-II)]

Correct Answer: (c) m/s²
Solution:The rate of change (increase) in the velocity of an object is called acceleration.

The SI unit of acceleration is m/s² (ms⁻²).

42. The unit of acceleration is ____ . [S.S.C. Online CGL (T-I) 13.12.2022 (Shift-I)]

Correct Answer: (b) m/sec²
Solution:The rate of change (increase) in the velocity of an object is called acceleration.

The SI unit of acceleration is m/s² (ms⁻²).

43. For which of the following quantities the unit m/s² is used? [S.S.C. Online Constable GD 19.02.2019 (Shift-II)]

Correct Answer: (a) Acceleration
Solution:The rate of change (increase) in the velocity of an object is called acceleration.

The SI unit of acceleration is m/s² (ms⁻²).

44. Acceleration is equal to the rate of change of_____. [S.S.C. Online CGL (T-I) 20.04.2022 (Shift-III)]

Correct Answer: (a) velocity
Solution:The rate of change (increase) in the velocity of an object is called acceleration.

The SI unit of acceleration is m/s² (ms⁻²).

45. For which of the following quantities does the unit of time appear twice in the denominator? [SSC. JE Civil Exam 23.03.2021 (Shift-II)]

Correct Answer: (a) Acceleration
Solution:The rate of change (increase) in the velocity of an object is called acceleration.

The SI unit of acceleration is m/s² (ms⁻²).

So it is clear from above that the unit of time for the amount of acceleration appears twice in the denominator. Hence option (a) is the correct answer

46. Which one among the following measures the same quantity as that is measured by the SI unit 'pascal'? [S.S.C. Online CPO S.1. (T-I) 23.11.2020 (Shift-I)]

Correct Answer: (a) torr
Solution:From the following, torr measures the same quantity as that is measured by the S.I. unit Pascal.

A non-SI unit of pressure, with 1 torr approximately equal to 133.322 Pa.

47. What is impulse equal to? [S.S.C. Online CHSL (T-I) 16.01.2017 (Shift-II)]

Correct Answer: (a) Change in momentum
Solution:Impulse, in physics, is equal to the change in momentum of an object, which can be calculated by the formula:

Impulse = Force × Time.

48. 'Impulse' can be defined as: [S.S.C. Online CPO S.I. (T-I) 11.11.2022 (Shift-III)]

Correct Answer: (c) the force acting on a body for a short time
Solution:In physics, "impulse" is defined as the change in momentum of an object, which is equal to the product of the average force applied to the object and the time duration over which that force is applied.

The SI unit of impulse is Newton-seconds (N⋅s) or kg⋅m/s.
Impulse (J) is calculated as:
J = F × Δt
where:
F = average force
Δt = time interval over which the force acts

49. The combined effect of mass and velocity is taken into account by a physical quantity called _____ . [S.S.C. Online MTS (T-I) 9.10.2017 (Shift-III)]

Correct Answer: (c) momentum
Solution:Mass and velocity are both considered to be quantities which define motion.

The combination of both is called the quantity of motion.

It is momentum, P = mv

50. The combined effect of mass and velocity is taken into account by a physical quantity called_____. [S.S.C. Online MTS (T-I) 9.10.2017 (Shift-III)]

Correct Answer: (c) momentum
Solution:Mass and velocity are both considered to be quantities which define motion.

The combination of both is called the quantity of motion.
It is momentum, P = mv
SI Unit of Momentum = kg·m/s