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Physics MCQs | Objective Type Questions SET-31
Q1. Lakes freeze in cold countries in winter leaving the water underneath at
(a) 0°C
(b) 0°F
(c) 4°C
(d) 4°F
Ans. : (c) 4°C
Q2. Which one of the following determines the sharpness of image in a camera?
(a) The aperture
(b) The exposure time
(c) The focal length of the lens
(d) Size of the camera
Ans. : (a) The aperture
Q3. In MRI machine which one of the following is used?
(a) Sound wave
(b) X-ray
(c) Ultrasound wave
(d) Magnetic wave
Ans. : (d) Magnetic wave
Q4. For a person having hyper metropia the near point is
(a) greater than 25 cm
(b) greater than 50 cm
(c) less than 25 cm
(d) infinity
Ans. : (a) greater than 25 cm
Q5. Amount of water vapour in the atmosphere is measured in terms of
(a) Humidity
(b) Droplets
(c) Smog
(d) All of the above
Ans. : (a) Humidity
Q6. Name the process of production of energy in the Sun
(a) Nuclear fission
(b) Radioactivity
(c) Nuclear fusion
(d) Ionization
Ans. : (c) Nuclear fusion
Q7. A spherical ball made of steel when dropped in mercury container will
(a) sink in mercury
(b) will be on the surface of mercury
(c) will be partly immersed mercury
(d) will dissolve in mercury
Ans. : (b) will be on the surface of mercury
Q8. The sound having a frequency of 20 hertz to 20000 hertz are known as
(a) Audible sounds
(b) Ultrasonic's
(c) Infrasonic
(d) Mega sonics
Ans. : (a) Audible sounds
Q9. Eclipses occur due to which optical phenomena?
(a) Reflection
(b) Refraction
(c) Rectilinear propagation
(d) Diffraction
Ans. : (c) Rectilinear propagation
Q10. Pure water is bad conductor of electricity because it is
(a) feebly ionized
(b) not volatile
(c) a very good solvent
(d) a non polar solvent
Ans. : (a) feebly ionized
