Practice Light heat thermodynamics wave sound optics oscillation - general science mcq Online Quiz (set-1) For All Competitive Exams
Q-1) The number of colours contained in the Sunlight is
(a)
(b)
(c)
(d)
Q-2) When a mirror is rotated by an angle q, the reflected ray will rotate by
(a)
(b)
(c)
(d)
Q-3) The least distance (in cm) of distinct vision in
(a)
(b)
(c)
(d)
Q-4) Human ears can sense sound waves travelling in air having wavelength of
(a)
(b)
(c)
(d)
Q-5) Which is not a primary colour?
(a)
(b)
(c)
(d)
Q-6) The graph given above indicates change in temperature (Dt) when heat (Q) was given to a substance. Which among the following parts of the graph correctly depict the latent heat of the substance?
(a)
(b)
(c)
(d)
Q-7) Consider the following statements :
- Convex lens is used ina terrestrial telescope.
- Convex lens of a small focal length is used as a magnifying glass.
- Convex lens forms an enlarged image of an object, when the object is placed beyond the focus of the lens.
Which of these statements are correct?
(a)
(b)
(c)
(d)
The enlarged image is formed by a convex lens when the object is placed between F1 and 2F1. Behind 2F1 the size of the image continuous decreases.
At 2F1, the size of the image formed by the convex lens is as same as the object.
Q-8) Consider the following natural phenomena.
- Terrestrial heating
- Reflection of light
- Refraction of light
- Diffraction of light
Due to which of these phenomena is mirage formed?
(a)
(b)
(c)
(d)
Q-9) What is the distance between two successive crests or successive troughs called?
(a)
(b)
(c)
(d)
Q-10) Consider the following statements:
- The values of u and f for a concave lens are always negative by convention.
- The power of a convex lens is negative and that of a concave lens is positive.
- A concave lens always forms a virtual, erect and smaller image.
Which of these statements are correct?
(a)
(b)
(c)
(d)
Power of lens is defined as P = 1 f
where f = focal length of the lens.
For, convex lens f = (+)ve concave lens f = (–)ve
Q-11) Which of the following lens is used to minimize Myopia?
(a)
(b)
(c)
(d)
Q-12) When ice melts, then
(a)
(b)
(c)
(d)
Q-13) The terminal colour bands of the rainbow are
(a)
(b)
(c)
(d)
Q-14) In order that the heat flows from one part of a solid to another part, what is required?
(a)
(b)
(c)
(d)
As heat flows from higher temperature to lower temperature, so a temperature gradient is required.
Q-15) In the season of summer, we experience a humid heat when weather
(a)
(b)
(c)
(d)
Q-16) Range of audio-frequencies is
(a)
(b)
(c)
(d)
Q-17) A coin in a beaker filled with water appears raised. This phenomenon occurs because of the property of
(a)
(b)
(c)
(d)
We know that, the apparent depth is m times less than the actual depth. i.e.,$d_{apparent} = {d_{actual}}/μ$
Q-18) The red colour of the Sun at Sunset and Sunrise is due to
(a)
(b)
(c)
(d)
Q-19) In producing a pure spectrum, the incident light is passed through a narrow slit placed in the focal plane of an achromatic lens because a narrow slit
(a)
(b)
(c)
(d)
We know that C = sin-1 $(1/μ)$
Given iB > iA, ∴ μB < μA
So B is rarer and A is denser. Light will be totally reflected when it passes from A to B. Now critical angle for A to B
CAB = sin-1 $(1/_Bμ_A)$ = sin-1 $(_Aμ_B)$
sin-1 $(μ_B/μ_A)$ = sin-1 $({i_B}/i_A)$.
Q-20) The Sun is visible to us a few minutes before the actual sunrise because of
(a)
(b)
(c)
(d)