Practice Question answer set 1 - general science mcq Online Quiz (set-1) For All Competitive Exams
Q-1) The number of images of an object placed between two parallel mirrors is
(a)
(b)
(c)
(d)
Q-2) Find out the odd colour from the following options.
(a)
(b)
(c)
(d)
Q-3) The heat required in calories to convert one gram of ice at 0°C to steam at 100°C is approximately
(a)
(b)
(c)
(d)
Q-4) Sound waves do not travel in
(a)
(b)
(c)
(d)
Q-5) Photosynthesis using the invisible part of the Sunlight is done by some
(a)
(b)
(c)
(d)
Q-6) Consider the following statements for a simple harmonic motion:
- The magnitude of the velocity of the body is proportional to its displacement from the mean position.
- The magnitude of the acceleration of the body is proportional to its displacement from the mean position.
- The sum of the kinetic energy and potential energy of the body is always constant.
Which of the statements given above is/are correct?
(a)
(b)
(c)
(d)
Let the displacement (y) of a particle executing SHM at an instant be given by.
y = a sin (ωt + φ)
velocity, v = ${dy}/{dt}$ = aω cos(ω + φ)
Hence, the magnitude of the velocity of a body is not proportional to its displacement from the mean position.
Acceleration, A = ${dv}/{dt}$ = –aω2 sin (ωt + φ) = - ω2y
Hence, |A| ∝ y
The total energy in SHM is given by
E = PE + KE = EP + EK = 1/2 mω2a2 = a constant
Q-7) When pressure on piece of ice is increases its melting point
(a)
(b)
(c)
(d)
Q-8) The turntable of a gramophone is rotated at a constant speed of x revolutions/minute. Which one of the following values of the revolutions per minute is not used ?
(a)
(b)
(c)
(d)
Q-9) When a glass rod is placed in steam, its length increases but its width
(a)
(b)
(c)
(d)
Q-10) Consider the following statements: - Speed of wave = $\text"wave length"/\text"time period"$.
- Wavelength is the distance between two nearest particles in phase.
- The flash of lightening is seen before the sound of thunder is heard.
- Speed of sound is greater than speed of light.
Which of the statements given above are correct?
(a)
(b)
(c)
(d)
Speed of sound at NTP = 332 m/s,
whereas speed of light is 3 × 108