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NEET Previous Year Questions (2014-2023): Physical World, Units & Measurement | Physics Class 11 PDF Download

Q.1. A metal wire has mass (0.4 ± 0.002) g, radius (0.3 ± 0.001) mm and length (5 ± 0.02) cm. The maximum possible percentage error in the measurement of density will nearly be     [2023]
A: 1.2%
B: 1.3%
C: 1.6%
D: 1.4%
Ans: 
C
Solution: 
NEET Previous Year Questions (2014-2023): Physical World, Units & Measurement | Physics Class 11

Q.2. The errors in the measurement which arise due to unpredictable fluctuations in temperature and voltage supply are      [2023]
A: Instrumental errors
B: Personal errors
C: Least count errors
D: Random errors
Ans: 
d
Solution: The errors which cannot be associated with any systematic or constant cause are called random errors. These errors can arise due to unpredictable fluctuations in experimental conditions. e.g., random change in pressure, temperature, voltage supply etc.



Q.3. The dimensions [MLT–2A–2 ] belong to the              [2022]
A: Self-inductance
B: Magnetic permeability
C: Electric permittivity
D: Magnetic flux

Ans: B
Solution:
The dimensional formula of magnetic permeability is [MLT–2A–2 ]

Q.4. 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]
A: 1382 

B: 1382.5
C: 14 * 10 
D: 138 * 10
1
Ans: C
Solution:
Area = Length × Breadth

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

Q.5. Match List-I with List-II
NEET Previous Year Questions (2014-2023): Physical World, Units & Measurement | Physics Class 11

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

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

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

D: (a) - (ii), (b) - (i), (c) - (iv), (d) - (iii)
Ans: A
Solution:
NEET Previous Year Questions (2014-2023): Physical World, Units & Measurement | Physics Class 11


Q.6. Plane angle and solid angle have       [2022]
A: Dimensions but no units 
B: No units and no dimensions 
C: Both units and dimensions 
D: Units but no dimensions 
Ans: D
Solution:
NEET Previous Year Questions (2014-2023): Physical World, Units & Measurement | Physics Class 11 


Q.7. 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,

NEET Previous Year Questions (2014-2023): Physical World, Units & Measurement | Physics Class 11

Q.8. 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:

NEET Previous Year Questions (2014-2023): Physical World, Units & Measurement | Physics Class 11

Q.9. 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.10. 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
NEET Previous Year Questions (2014-2023): Physical World, Units & Measurement | Physics Class 11
As per rule
least no. of place in decimal portion of any number 9.98

Q.11. 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 NEET Previous Year Questions (2014-2023): Physical World, Units & Measurement | Physics Class 11 will be     [2019]
A: NEET Previous Year Questions (2014-2023): Physical World, Units & Measurement | Physics Class 11
B: 16 %
C: -10 %
D: 10 %
Ans:
B
Given
NEET Previous Year Questions (2014-2023): Physical World, Units & Measurement | Physics Class 11
NEET Previous Year Questions (2014-2023): Physical World, Units & Measurement | Physics Class 11
 NEET Previous Year Questions (2014-2023): Physical World, Units & Measurement | Physics Class 11
NEET Previous Year Questions (2014-2023): Physical World, Units & Measurement | Physics Class 11
= 2% + 1%+ 1%+ 12%= 16%

Q.12. 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.13. A physical quantity of the dimensions of length that can be formed out of NEET Previous Year Questions (2014-2023): Physical World, Units & Measurement | Physics Class 11 is velocity of light, G is universal constant of gravitation and e is charge] :-    [2017]


A: NEET Previous Year Questions (2014-2023): Physical World, Units & Measurement | Physics Class 11
B: NEET Previous Year Questions (2014-2023): Physical World, Units & Measurement | Physics Class 11
C: NEET Previous Year Questions (2014-2023): Physical World, Units & Measurement | Physics Class 11
D: NEET Previous Year Questions (2014-2023): Physical World, Units & Measurement | Physics Class 11
Ans: D
Solution:

NEET Previous Year Questions (2014-2023): Physical World, Units & Measurement | Physics Class 11

Q.14. 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:
NEET Previous Year Questions (2014-2023): Physical World, Units & Measurement | Physics Class 11

Q.15. 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:
NEET Previous Year Questions (2014-2023): Physical World, Units & Measurement | Physics Class 11

The document NEET Previous Year Questions (2014-2023): Physical World, Units & Measurement | Physics Class 11 is a part of the NEET Course Physics Class 11.
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FAQs on NEET Previous Year Questions (2014-2023): Physical World, Units & Measurement - Physics Class 11

1. What is the importance of understanding the concept of physical world, units, and measurement in the NEET exam?
Ans. Understanding the concept of physical world, units, and measurement is crucial for the NEET exam as it forms the foundation of various scientific disciplines. Questions related to these topics are commonly asked in the exam and a strong grasp on these concepts is necessary to solve numerical problems accurately.
2. How can I improve my understanding of units and measurement for the NEET exam?
Ans. To improve your understanding of units and measurement, it is recommended to practice solving numerical problems regularly. Familiarize yourself with the different units used in physics and their conversions. Additionally, studying from reliable textbooks and referring to online resources can also help in clarifying any doubts or misconceptions.
3. Can you provide some examples of commonly used units in physics?
Ans. Certainly! Some commonly used units in physics include meters (m) for measuring length, kilograms (kg) for measuring mass, seconds (s) for measuring time, and joules (J) for measuring energy. Other units like newtons (N) for force, volts (V) for electric potential, and hertz (Hz) for frequency are also frequently used in physics.
4. How can I ensure accurate measurements in physics experiments for the NEET exam?
Ans. To ensure accurate measurements in physics experiments, it is important to use appropriate measuring instruments and techniques. Calibrate the instruments before use, avoid parallax errors while reading measurements, and repeat the measurements multiple times to minimize random errors. Additionally, using significant figures and understanding the limitations of the measuring instruments can also help in obtaining accurate results.
5. What is the significance of understanding the physical world in the NEET exam?
Ans. Understanding the physical world is significant in the NEET exam as it helps in comprehending the fundamental principles and laws of physics. It enables students to apply these principles to solve complex problems and analyze real-life scenarios. A strong understanding of the physical world is essential for success in physics and related disciplines.
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