1. Dioptre power of a concave lens of 10 cm focal length is
A. 10 dioptre
B. 10 dioptre
C. 1 / 10 dioptre
D. 1 / 10 dioptre
✅ The correct answer is option B.
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2. The dimensions of the coefficient of viscosity are
A. ML-1T-1
B. M2L1T1
C. ML1T-1
D. M2L-1T-1
✅ The correct answer is option A.
3. In vibratory motion
A. P.E. remains constant
B. K.E. remain constant
C. total energy remains constant
D. total momentum remains constant
✅ The correct answer is option C.
4. The power of a concave lens is
A. Real
B. Virtual
C. Positive
D. Negative
✅ The correct answer is option D.
5. Terminal velocity is
A. Uniform
B. Maximum
C. Uniform and maximum
D. Neither uniform nor maximum
✅ The correct answer is option C.
6. The waveform of S.H.M. is
A. Standing wave
B. Sine wave
C. Square wave
D. None
✅ The correct answer is option B.
7. The minimum distance between an object and its real image in a convex lens is
A. 2 f
B. 2.5 f
C. 3f
D. 4f
✅ The correct answer is option D.
8. When the body moves with terminal velocity the acceleration in the body become
A. 0
B. Maximum
C. Variable
D. Infinite
✅ The correct answer is option A.
9. S.I unit of frequency is
A. Vibration S-2
B. Radian
C. Hertz
D. ms-1
✅ The correct answer is option C.
10. If an object is placed away from 2f of a converging lens then the image will be
A. Real and erect
B. Virtual and erect
C. Real and inverted
D. Virtual
✅ The correct answer is option C.