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Practice MCQ Questions and answers on Physics-GK

Learn and practice General Knowledge questions and answers on Physics with very easy and understandable explanations. GK questions are very helpful different type of competitive exams. Page-1 section-3

Each section contains 100 MCQs on Physics .
1
When heated from 0 to 100oC volume of a given mass of water will :
Discuss
Answer & Solution
Answer: Option D
Solution:
From water at 0°C to water at 4°C, on addition of heat, the water surprisingly, contracts till it reaches maximum density at 4°C. This negative thermal expansion is termed as the anomalous expansion of water. From water at 4°C to water at 100°C, water shows a positive cubical thermal expansion like other substances and gradually expand with the increase in temperature.
2
When a bottle of perfume is opened in one corner of a room the smell spreads soon throughout the room. This is an example of
Discuss
Answer & Solution
Answer: Option D
Solution:
When a bottle of perfume is opened in a corner of a room, the scent soon spreads all over the room. This physical procedure is called diffusion, due to which the liquid or gaseous molecules travels from the area of higher density to that of the lower density of that substance.
3
Which of the following laws validates the statement that matter can neither be created nor destroyed ?
Discuss
Answer & Solution
Answer: Option C
Solution:
Law of conservation of mass validates the statement that matter can neither be created nor destroyed.
4
The boiling point of liquids vary as
Discuss
Answer & Solution
Answer: Option A
Solution:
The boiling point of a liquid varies according to the applied pressure; the normal boiling point is the temperature at which the vapour pressure is equal to the standard sea-level atmospheric pressure (760 mm [29.92 inches] of mercury). At sea level, water boils at 100°C (212°F).
5
The freezing point of fresh water is ________ .
Discuss
Answer & Solution
Answer: Option D
Solution:
Freezing point is the temperature where a liquid converts into solid. Water converts into ice at zero degrees centigrade. So degree zero centigrade is the freezing point of water.
6
The density of water is 1 g/cc. This is strictly valid at
Discuss
Answer & Solution
Answer: Option B
Solution:
The density of water is 1 g/cc. This is strictly valid at 4°C.
7
Specific gravity is defined as the ratio of
Discuss
Answer & Solution
Answer: Option A
Solution:
Specific gravity is defined as the ratio of density of the substance to the density of water.
8
The cause for the Tsunami, as deduced by the seismologists, is
Discuss
Answer & Solution
Answer: Option C
Solution:
Seismologists say only earthquakes measuring greater than 7.0 on the Richter scale can produce a major tsunami. The friction between two slow-moving plates of the Earth's crust creates vast amounts of seismic energy which is released in the form of an earthquake.
9
Which statement best describes an igneous intrusion?
Discuss
Answer & Solution
Answer: Option B
Solution:
Magma is injected into surrounding rock forming an igneous intrusive is the statement that best describe an igneous intrusion.
10
Which is a common first indicator of an approaching thunderstorm?
Discuss
Answer & Solution
Answer: Option C
Solution:
They usually appear as swift-moving black clouds, often approaching from the northwest southwest, south or west at speeds of 25-35 knots. You can determine the distance of an approaching thunderstorm by counting the number of seconds between the lightning flash and the thunder clap, and dividing by five.