Practice Practice test - 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) A man standing between two parallel hills fires a gun and hears two echoes, one 2.5 s and the other 3.5 s after the firing. If the velocity of sound is 330 m$s^{–1}$, how long will it take him to hear the third echo?
(a)
(b)
(c)
(d)
Q-4) If a gas is compressed to half of its original volume at 27°C, to what temperature should it be heated to make it occupy its original, volume?
(a)
(b)
(c)
(d)
Q-5) As per the WHO, the safe noise level for a city is
(a)
(b)
(c)
(d)
Q-6) For which wavelength of light is our eye most sensitives
(a)
(b)
(c)
(d)
Our eye can see wavelength of light range 4000Å to 7800Å
Q-7) A gas can be liquefied by increasing the pressure – - above the critical pressure only.
- only when the temperature of the enclosed gas is below the critical temperature.
- only when the volume of the enclosed gas is below the critical volume.
Which of the statements given above is / are correct ?
(a)
(b)
(c)
(d)
The realgas cannotbe liquefiedabove criticaltemperature by applying pressure.
Q-8) In which medium the speed of sound is maximum at a temperature of around 20°C?
(a)
(b)
(c)
(d)
Q-9) If the temperature of air increases, how would it affect its ability to assume water vapour?
(a)
(b)
(c)
(d)
Q-10) When a copper ball is heated, the largest percentage increase will occur in its
(a)
(b)
(c)
(d)
When a copper ball is heated, its size increases.
As volume ∝ (radius)3 and Area ∝ (radius)2,
So the percentage increase will be the largest in its volume.
Density will decrease with rising temperature.