In Huygen’s wave theory, the locus of all points in the same state of vibration is called
(a) A half period zone (b) Oscillator (c) A wave-front (d) A ray Solution: Answer: (c) A wave-front
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Optical rotation of the substance is
(a) the rotation of plane-polarized light by a substance (b) changes the direction of polarised light (c) does not allow... View Article
An optically active compound
(a) rotates the plane polarised light (b) changes the direction of polarised light (c) does not allow plane polarised light... View Article
Assertion : The resolving power of a telescope is more if the diameter of the objective lens is more. Reason : Objective lenses of large diameter collectd more light.
(a) If both, Assertion and Reason are true and the Reason is the correct explaination of the Assertion. (b) If... View Article
Resolving power of a telescope will be more, if the diameter a of the objective is
(a) larger (b) smaller (c) resolving power does not depend on a (d) None of the above Solution: Answer: (a)... View Article
Interference may be seen using two independent
(a) sodium lamps (b) fluorescent tubes (c) lasers (d) None of these Solution: Answer: (d) Two independent sources cannot cause... View Article
Why cannot we obtain interference using two independent sources of light?
Two independent sources are not coherent sources. That is why they cannot produce interference.
Which one of the following properties of light does not support the wave theory of light?
(a) Light obeys laws of reflection and refraction (b) Light waves get polarised (c) Light shows photoelectric effect (d) Light... View Article
Two coherent monochromatic beams of intensities I and 4I respectively are superposed. The maximum and minimum intensities in the resulting pattern are
(a) 5I and 3I (b) 9I and 3I (c) 4I and I (d) 9I and I Solution: Answer: (d) The... View Article
A Young’s double slit set up for interference is shifted from air to within water, then the fringe width.
(a) Becomes infinite (b) decreases (c) increases (d) remain unchanged Solution: Answer: (b) When a Young’s double slit set up... View Article
Which one of the following phenomenon exhibits particle’s nature of light?
(a) Interference (b) Diffraction (c) Polarisation (d) Photoelectric effect Solution: Answer: (c) Photoelectric effect states that light travels in the... View Article
Which phenomenon best supports the theory that matter has a wave nature?
(a) Electron momentum (b) Electron diffraction (c) Photon momentum (d) Photon diffraction Solution: Answer: (b) The diffraction of a beam... View Article
In a given direction, the intensities of the scattered light by a scattering substance for two beams of light are in the ratio of 256: 81. The ratio of the frequency of the first beam to the frequency of the second beam is
a) 64:127 b) 21: 123 c) 64:27 d) None of these Solution: Answer: (d) According to Rayleigh scattering formula Intensity... View Article
According to Newton’s corpuscular theory, the speed of light is
(a) lesser in rarer medium(b) same in all the medium(c) lesser in denser medium(d) independent of the medium Solution: Answer:... View Article
∫ab (|x| / x) dx, where a < 0 < b, =
1) |b| – |a| 2) |b| + |a| 3) |a – b| 4) None of these Solution: (1) |b| –... View Article
∫-22 (x – |x|) dx =
1) 0 2) 2 3) 4 4) -4 Solution: (4) -4 \(\begin{array}{l}I =\int_{-2}^{2}(x-|x|) d x \\ =\int_{-2}^{2} x d x-\int_{-2}^{2}|x|... View Article
∫-11 |1 – x| dx =
1) -2 2) 0 3) 2 4) 4 Solution: (3) 2 \(\begin{array}{l}I =\int_{-1}^{1}|1-x| d x \\ =\left[+\int_{-1}^{1}(1-x) d x\right] \\... View Article
∫-ππ [2x (1 + sin x) / (1 + cos2 x)] dx =
1) π2/4 2) π2 3) Zero 4) π/2 Solution: (2) π2 \(\begin{array}{l}I =\int_{-\pi}^{\pi} \frac{2 x(1+\sin x)}{1+\cos ^{2} x} d x... View Article
Evaluate ∫0π/2 (√sin x) / [(√sin x + √cos x)] dx
1) π/4 2) π/2 3) Zero 4) 1 Solution: (1) π/4 \(\begin{array}{l}\begin{array}{l} I=\int_{0}^{\frac{\pi}{2}} \frac{\sqrt{\sin x}}{\sqrt{\sin x}+\sqrt{\cos x}} d x \\... View Article
∫010π |sin x| dx =
1) 20 2) 8 3) 10 4) 18 Solution: (1) 20 \(\begin{array}{l}I =\int_{0}^{10 \pi}|\sin x| d x=5\left[\int_{0}^{\pi} \sin x d... View Article
