JEE NEET PHYSICS MCQs (Set-2)

FOR NEET - IIT JEE and Other Engineering or premedical Entrance Examinations

Topics Covered: Units & Dimensions, Error in Measurement

Q1: Which of the following sets cannot enter into the list of fundamental quantities in any system of unit

(a) length, mass and velocity
(b) length, time and velocity
(c) mass, time and velocity
(d) length, time and mass

Q2: The base quantity among the following is:

(a) Speed
(b) Weight
(c) Length
(d) Area

Q3: A dimensionless quantity

(a) never has a unit
(b) always has a unit
(c) may have a unit
(d) does not exit

Q4: Ampere second is a unit of

(a) Current
(b) Charge
(c) Energy
(d) Power

Q5: Which pair of following quantities has dimensions different from each other.

(a) Impulse and linear momentum
(b) Plank’s constant and angular momentum
(c) Moment of inertia and moment of force
(d) Young’s modulus and pressure

Q6:  A watt is:

(a) kg m/s²
(b) kg m²/s³
(c) kg m/s
(d) kg m²/s²

Q7: The order of the magnitude of speed of light in SI unit is

(a) 16
(b) 8
(c) 4
(d) 7

Q8: The most accurate reading of the length of a 6.28 cm long fibre is

(a) 6 cm
(b) 6.5 cm
(c) 5.99 cm
(d) 6.0 cm

Q9: An experiment measures quantities x, y, z and then t is calculated from the data as t = xy²/z³. If percentage errors in x, y and z are respectively 1%, 3%, 2%, then percentage error in t is:

(a) 13%
(b) 10%
(c) 4%
(d) 7%

Q10: Which of the following is the most precise measurement?

(a) 0.003 m
(b) 0.0030 m
(c) 0.03 m
(d) 0.00300 m

1: (b) length, time and velocity [Velocity depends on distance and time, ∴ it can't be a base quantity. ]
2: (c) Length
3: (c) may have a unit  (e.g. radian)
4: (b) Charge
5: (c) Moment of inertia and moment of force
6: (b) kg m²/s³
7: (b) 8
8: (b) 6.5 cm
9: (a)13%
10: (d) 0.00300 m