set 1 MCQ Questions & Answers Detailed Explanation
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) 3 × $10^8$ km/s
(b) 3 × $10^8$ m/s
(c) 3 × $10^10$ m/s
(d) 3 × $10^8$ light years
The correct answers to the above question in:
Answer: (b)
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Read more light heat thermodynamics wave sound optics oscillation Based General Science Questions and Answers
Question : 1
Which one of the following types of waves are used in a Night Vision apparatus?
a) Infra-red waves
b) Micro waves
c) Radio waves
d) None of the above
Answer »Answer: (a)
Question : 2
Ultrasonic waves have frequency
a) only above 20,000 Hz
b) below 20 Hz
c) between 20 and 20,000 Hz
d) only above 20,000 MHz
Answer »Answer: (a)
Question : 3
Cloudy nights are warmer compared to clear cloudless nights, because clouds
a) produce heat and radiate it towards earth
b) reflect back the heat given off by earth
c) prevent clod waves from the sky from descending on earth
d) absorb heat from the atmosphere and send it towards earth
Answer »Answer: (b)
Cloudy nights are warmer than clear nights because, the cloud cover provides a shield which act as an insulator and store up the heat radiated by the earth and do not permit heat to escape.
Question : 4
When a glass rod is placed in steam, its length increases but its width
a) Decreases
b) Increases
c) Remains unchanged
d) Becomes irregular
Answer »Answer: (b)
Question : 5
The heat required in calories to convert one gram of ice at 0°C to steam at 100°C is approximately
a) 336
b) 720
c) 80
d) 620
Answer »Answer: (b)
Question : 6
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) 56 r.p.m.
b) 78 r.p.m.
c) 45 r.p.m.
d) 33 r.p.m.
Answer »Answer: (a)
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