Practice Physics test - general science mcq Online Quiz (set-1) For All Competitive Exams
Q-1) The temperature of a room is 77°F. What would it be on the Celsius scale?
(a)
(b)
(c)
(d)
Q-2) Which of the following is used to find the depth of sea?
(a)
(b)
(c)
(d)
Q-3) The velocity of sound is maximum in
(a)
(b)
(c)
(d)
Q-4) Put in ascending order the speed of sound in the mediums.- Water
- Steel
- Nitrogen
(a)
(b)
(c)
(d)
Q-5) Rainbow is produced when Sunlight falls on drops of rain, which of the following physical phenomena are responsible for this? - Dispersion
- Refraction
- Internal reflection
Select the correct answer using the code given below.
(a)
(b)
(c)
(d)
Q-6) Consider the following statements :- Fahrenheit is the smallest unit measuring temperature.
- Fahrenheit was the first temperature scale used for measuring temperature.
- The temperature at which Centigrade and Fahrenheit thermometers read the same is – 40°.
Which of the statements are correct?
(a)
(b)
(c)
(d)
Reamer was the first temperature scale.
Q-7) Consider the following statements: - Light has transverse wave nature.
- Light cannot travel in vacuum.
- No particle can ever move at a speed greater than the speed of light in vacuum.
Which of these statements are correct?
(a)
(b)
(c)
(d)
Yes light can travel through vacuum. It is because light waves consists of magnetic field which is perpendicular to electric field which results in creation of potential difference between two points and light wave propagates.
Q-8) Consider the following statements:
- Light of longer wavelength are scattered much more than the light of shorter wavelength.
- The speed of visible light in water is 0.95 times the speed in vacuum.
- Radio waves are produced by rapidly oscillating electrical currents.
- To detect the over speeding vehicles, police use the Doppler effect of reflected short radio waves.
Which of these statements are correct?
(a)
(b)
(c)
(d)
Radio waves are a form of electromagnetic radiation, created whenever a charged object (in normal radio transmission, an electron) accelerates with a frequency that lies in the radio frequency (RF) portion of the electromagnetic spectrum.
Thus statement 3 is correct.
The Doppler’s Effect shows a change in a wave’s frequency received when it is either reflected from a moving object or generated on a moving object. Police radar speed detectors bounce a radio frequency wave off cars and use their internal electronics to determine the speed at which the object is moving by that frequency change.
Therefore, statement 4 is also correct.
Q-9) The minimum height of mirror required to see whole stand up image of a man of height 1.50 metre shall be
(a)
(b)
(c)
(d)
Q-10) Thermostat is related to
(a)
(b)
(c)
(d)