A. Dimensionless
B. Dimensional scalar
C. Negative
D. All A, B and C are correct
✅ The correct answer is option D.
Physics MCQs
Prepare effectively with our Physics MCQs with answers and explanations for exams and job tests. Our collection covers key topics such as mechanics, thermodynamics, optics, electricity and magnetism, modern physics, waves, and quantum theory. These multiple-choice questions are designed for students, competitive exam aspirants, and professionals preparing for NTS, PPSC, FPSC, CSS, PMS, university entry tests, and physics-related job assessments. Practice online to strengthen your concepts, improve problem-solving skills, and excel in exams with our updated Physics MCQs
62. What is the SI unit of the modulus of elasticity of substance?
A. Nm-2
B. Jm-2
C. Nm-1
D. Being a number it has no unit
✅ The correct answer is option A.
63. A device based on photoelectric effect is called
A. Photosensitive detection
B. Photo diode
C. Photosynthesis
D. Photocell
✅ The correct answer is option D.
64. Unit vector n^ is along
A. X-axis
B. Normal on a surface
C. Y-axis
D. Z-axis
✅ The correct answer is option B.
65. What are the dimensions of stress?
A. MLT-2
B. ML-2T-1
C. ML-1T-2
D. ML-T-1
✅ The correct answer is option C.
66. The linear momentum of an X-ray photon of wavelength 0.1A is
A. 6.625x1023N-s
B. 66.25x1023N-s
C. 662.5x1023N-s
D. Data is insufficient
✅ The correct answer is option A.
67. Cosθi^ + Sinθj^ is a
A. Vector
B. Position Vector
C. Vector in the direction at angle θ with an x-axis
D. The unit vector in the direction at angle θ with an x-axis
✅ The correct answer is option D.
68. The figure showed the stress-strain graph of a certain substance. Over which region of the graph is Hooks law obeyed?
A. AB
B. BC
C. CD
D. ED
✅ The correct answer is option D.
69. Optical active crystals rotates the
A. Vibrating plane
B. Polarization plane
C. Diffraction plane
D. Interference plane
✅ The correct answer is option B.
70. Maximum number of rectangular components are
A. 1
B. 2
C. 3
D. 4
✅ The correct answer is option C.