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Previous Year Questions (2014-22): Physical World, Units & Measurement - Notes | Study Physics Class 11 - NEET

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Q.1. The dimensions [MLT–2A–2 ] belong to the              [2022]
(1) Self-inductance
(2) Magnetic permeability
(3) Electric permittivity
(4) Magnetic flux

Answer (2)  
The dimensional formula of magnetic permeability is [MLT–2A–2 ]

Q.2. The area of a rectangular field (in m2 ) of length 55.3 m and breadth 25 m after rounding off the value for correct significant digits is                           [2022]
(1) 1382 

(2) 1382.5
(3) 14 * 10 
(4) 138 * 10
1
Answer (3)
Area = Length × Breadth

= 55.3 × 25 m2
= 1382.5 m2 
= 14 × 102 m2
(Rounding off of two significant figures)

Q.3. Match List-I with List-II
Previous Year Questions (2014-22): Physical World, Units & Measurement - Notes | Study Physics Class 11 - NEET

Choose the correct answer from the options given below                 [2022]
(1) (a) - (ii), (b) - (iv), (c) - (i), (d) - (iii) 

(2) (a) - (ii), (b) - (iv), (c) - (iii), (d) - (i) 

(3) (a) - (iv), (b) - (ii), (c) - (i), (d) - (iii) 

(4) (a) - (ii), (b) - (i), (c) - (iv), (d) - (iii)
Answer (1)  
Previous Year Questions (2014-22): Physical World, Units & Measurement - Notes | Study Physics Class 11 - NEET


Q.4. Plane angle and solid angle have 
(1) Dimensions but no units 
(2) No units and no dimensions 
(3) Both units and dimensions 
(4) Units but no dimensions                                 [2022]
Answer (4)
Previous Year Questions (2014-22): Physical World, Units & Measurement - Notes | Study Physics Class 11 - NEET 

Q.5. A Screw Guage gives the following readings when used to measure the diameter of a wire.
Main scale reading = 0.0 mm
Circular scale reading = 52 divisions
Given that: 1 mm on the main scale corresponds to 100 divisions of the circular scale.
The diameter of the wire from the above data is:
    [2021]
A: 0.026 cm
B: 0.005 cm
C: 0.52 cm
D: 0.052 cm
Ans: 
D
Solution: Diameter of wire,

Previous Year Questions (2014-22): Physical World, Units & Measurement - Notes | Study Physics Class 11 - NEET

Q.6. If force [F], acceleration [A] and time [T] are chosen as the fundamental physical quantities. Find the dimensions of energy.    [2021]
A: [F][A][T-1]
B: [F][A-1][T]
C: [F][A][T]
D: [F][A][T2]
Ans: 
D
Solution:

Previous Year Questions (2014-22): Physical World, Units & Measurement - Notes | Study Physics Class 11 - NEET

Q.7. If E and G respectively denote energy and gravitational constant, then E/G has the dimensions of :    [2021]
A: [M] [L0] [T0]
B: [M2] [L–2] [T–1]
C: [M2] [L–1] [T0]
D: [M] [L–1] [T–1]
Ans: 
C
Solution:

E = energy = [ML2T–2]
G = Gravitational constant = [M–1L3T–2]
So,
E/G = [E]/[G]
= ML2T–2/M–1L3T–2
= [M2L-1T0]

Q.8. Taking into account of the significant figures, what is the value of 9.99 m-0.0099 m?    [2020]
A: 9.980 m
B: 9.9 m
C: 9.9801 m
D: 9.98 m

Ans: D
Previous Year Questions (2014-22): Physical World, Units & Measurement - Notes | Study Physics Class 11 - NEET
As per rule
least no. of place in decimal portion of any number 9.98

Q.9. In an experiment, the percentage of error occurred in the measurement of physical quantities A, B, C and D are 1%, 2%, 3% and 4% respectively. Then the maximum percentage of error in the measurement X, where Previous Year Questions (2014-22): Physical World, Units & Measurement - Notes | Study Physics Class 11 - NEET will be     [2019]
A: Previous Year Questions (2014-22): Physical World, Units & Measurement - Notes | Study Physics Class 11 - NEET
B: 16 %
C: -10 %
D: 10 %
Ans:
B
Given
Previous Year Questions (2014-22): Physical World, Units & Measurement - Notes | Study Physics Class 11 - NEET
Previous Year Questions (2014-22): Physical World, Units & Measurement - Notes | Study Physics Class 11 - NEET
 Previous Year Questions (2014-22): Physical World, Units & Measurement - Notes | Study Physics Class 11 - NEET
Previous Year Questions (2014-22): Physical World, Units & Measurement - Notes | Study Physics Class 11 - NEET
= 2% + 1%+ 1%+ 12%= 16%

Q.10. A student measured the diameter of a small steel ball using a screw gauge of least count 0.001 cm. The main scale reading is 5 mm and zero of circular scale division coincides with 25 divisions above the reference level. If screw gauge has a zero error of – 0.004 cm, the correct diameter of the ball is :-    [2018]
A: 0.521 cm
B: 0.525 cm
C: 0.053 cm
D: 0.529 cm

Ans: D
Solution:
Reading of screw gauge
= MSR + VSR × LC + zero error
= 0.5 cm + 25 × 0.001 cm + 0.004 cm
= 0.529 cm

Q.11. A physical quantity of the dimensions of length that can be formed out of Previous Year Questions (2014-22): Physical World, Units & Measurement - Notes | Study Physics Class 11 - NEET is velocity of light, G is universal constant of gravitation and e is charge] :-    [2017]


A: Previous Year Questions (2014-22): Physical World, Units & Measurement - Notes | Study Physics Class 11 - NEET
B: Previous Year Questions (2014-22): Physical World, Units & Measurement - Notes | Study Physics Class 11 - NEET
C: Previous Year Questions (2014-22): Physical World, Units & Measurement - Notes | Study Physics Class 11 - NEET
D: Previous Year Questions (2014-22): Physical World, Units & Measurement - Notes | Study Physics Class 11 - NEET
Ans: D
Solution:

Previous Year Questions (2014-22): Physical World, Units & Measurement - Notes | Study Physics Class 11 - NEET

Q.12. If energy (E), velocity (V) and time (T) are chosen as the fundamental quantities, the dimensional formula of surface tension will be:    [2015]
A: [E-2 V-1 T-3]
B: [E V-2 T-1]
C: [E V-1 T-2]
D: [E V-2 T-2]
Ans:
D
Solution:
Previous Year Questions (2014-22): Physical World, Units & Measurement - Notes | Study Physics Class 11 - NEET

Q.13. If force (F), velocity (V) and time(T) are taken as fundamental units, then the dimensions of mass are:    [2014]
A: [F V−1 T−1]
B: [F V−1 T]
C: [F V T−1]
D: [F V T−2]
Ans:
B
Solution:
Previous Year Questions (2014-22): Physical World, Units & Measurement - Notes | Study Physics Class 11 - NEET

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