300+ TOP MCQs on Physical World And Measurement and Answers

NEET  Physics is the very imporatant paper in the Medical Entrance EXAM. So these NEET Physics MCQs with Answers for all Concepts as per the new syllabus. Practice daily with these NEET Physics objective questions on air pollution . NEET Physics Physics Physical World And Measurement Multiple Choice Questions

MCQs on Physical World And Measurement :

1. How many numbers of base SI units are there?
(A) 5
(B) 10
(C) 7
(D) 9

Answer

Answer: (C) 7

2. What is the percentage error in the measurement of the kinetic energy of a body, if there is a positive error of 50% in the speed of the body
(A) 125%
(B) 30%
(C) 50%
(D) 100%

Answer

Answer: (D) 100 %

3. What is the dimensional formula of torque and energy
(A) [ML-3T-2] and [MLT-2]
(B) [ML2T-2] and [MLT-2]
(C) [ML2T-2] and [ML2T2]
(D) [MLT2] and [ML2T2]

Answer

Answer: (C) [ML2T-2] and [ML2T2]

4. Find the relative error of y, if y=x2
(A) (frac{triangle x}{x})
(B) (frac{2 triangle x}{x})
(C) (frac{(wedge x)^{2}}{x})
(D) (△x)2

Answer

Answer: (B) (frac{2 triangle x}{x})

5. Identify the physical parameters that are having the same dimensions from the below-given list:
(i) Magnetic field
(ii) Energy density
(iii) Refractive index
(iv) Young’s modulus
(v) Dielectric constant
(A) (ii) and (iv)
(B) (i) and (v)
(C) (iii) and (iv)
(D) (iv) and (iii)

Answer

Answer: (A) (ii) and (iv)

6. What is the angle between A and B, if (vec{A}+vec{B}=vec{C}) such that (vec{C}) is perpendicular to (vec{A}) and (|vec{A}|=|vec{C}|)
(A) π
(B) (frac{pi}{2})
(C) (frac{pi}{4})
(D) (frac{3 pi}{4})

Answer

Answer: (D) (frac{3 pi}{4})

7. Which the following is a dimensionless quantity
(A) Refractive index
(B) Gravitational constant
(C) Velocity
(D) Planck’s constant

Answer

Answer: (B) Gravitational constant

8. Calculate the value of the dot product of the two vectors whose magnitudes are 3 units and 4 units and their resultant is 1 unit.
(A) +6 units
(B) 0
(C) -12 units
(D) -1 unit

Answer

Answer: (C) -12 units

9. From the given three fundamental constants, select the combination that gives the dimension of length
(i) Newton’s gravitational constant (G)
(ii) Speed of light in a vacuum (C)
(iii) Planck’s constant (h)
Physical World And Measurement MCQs 1

Answer

Answer: (D) (sqrt{frac{h G}{c^{frac{3}{2}}}})

10. Following are the readings obtained while measuring the diameter of a wire by using the screw gauge0 mm is the main scale reading
52 divisions are the circular scale reading
What is the diameter of the wire if 1 mm on the main scale is equal to the 100 divisions on the circular scale
(A) 0.016 cm
(B) 0.052 cm
(C) 0.15 cm
(D) 0.05 cm

Answer

Answer: (B) 0.052 cm

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