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MOST IMPORTANT general science mcq - 16 EXERCISES
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The following question based on light, heat, thermodynamics, wave motion, sound, optics & oscillations topic of general science mcq
(a) Clouds absorb Sunlight during the day and radiate the same in night
(b) Clouds make the atmosphere damp and generate heat
(c) The clouds prevent radiation of heat from the ground and the air
(d) The clouds obstruct the movement of air which creates heat
The correct answers to the above question in:
Answer: (c)
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Read more light heat thermodynamics wave sound optics oscillation Based General Science Questions and Answers
Question : 1
Consider the following statements.
- If magenta and yellow coloured circles intersect, the intersected area will have a red colour.
- If cyan and magenta coloured circles intersect, the intersected area will have a blue colour.
a) Both 1 and 2
b) Only 2
c) Only 1
d) Neither 1 nor 2
Answer »Answer: (a)
Question : 2
FM broadcasting service uses the range of frequency bands between
a) 76-87 MHz
b) 54-75 MHz
c) 109-139 MHz
d) 88-108 MHz
Answer »Answer: (d)
Question : 3
Gases exert pressure on the walls of the container because the gas molecules
a) have finite volume
b) possess momentum
c) collide with each other
d) obey gas laws
Answer »Answer: (b)
Question : 4
Consider the following three statements
- Heating 1 kg of water from 10°C to 50°C
- Melting 600 g of ice at 0°C
- Converting 300 g of ice at 0°C to water at 50°C
a) 2, 1, 3
b) 1, 2, 3
c) 3, 2, 1
d) 3, 1, 2
Answer »Answer: (d)
Question : 5
On adding common salt to water, the boiling point and freezing point of water will
a) Decrease
b) Decrease and increase respectively
c) Increase
d) Increase and decrease respectively
Answer »Answer: (d)
Question : 6
Consider the following statements :
- The shock waves produced by a supersonic aircraft do not have much intensity.
- The speed of sound is maximum in solids.
- A bat emits ultrasonic waves.
- Sound waves of frequency below audible range are termed as ultrasonic.
a) 2 and 3
b) 1, 2 and 3
c) 1, 3, and 4
d) 1 and 4
Answer »Answer: (a)
A shock wave is a type of propagating disturbance. Like an ordinary wave, it carries energy and can propagate through a medium (solid, liquid, gas or plasma) or in some cases in the absence of a material medium. Across a shock wave there is always an extremely rapid rise in pressure, temperature and density of the flow.
Ultrasound is sound with a frequency greater than the upper limit of human hearing (greater than 20 kHz).
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