set 1 MCQ Questions & Answers Detailed Explanation
MOST IMPORTANT general science mcq - 3 EXERCISES
The following question based on measurement and SI units topic of general science mcq
(a) 10.0 bar
(b) 0.1 bar
(c) 1.0 bar
(d) 100.0 bar
The correct answers to the above question in:
Answer: (c)
Kilogram or Kilogram Force per Square Centimeter (kg/cm2 or kgf/cm2) is a pressure unit that has been largely superseded by the SI unit system of pascal units.
It is the metric equivalent of pounds per square inch (psi). 1 kg/cm2 equals 98,066.5 pascals.
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Question : 1
An iron ball and a wooden ball of same radius are released from a height ‘h’ in vacuum. Which of the two balls would take more time to reach the ground?
a) Wooden ball
b) Iron ball
c) Both would take same time
d) None of these
Answer »Answer: (c)
Since the time of fall of both balls in a vacuum does not depend on the mass of balls, hence, the time taken by both balls will be exactly equal.
Question : 2
Among the following the derived quantity is
a) density
b) mass
c) length
d) time
Answer »Answer: (a)
Question : 3
What is the unit of atmospheric pressure?
a) Joule
b) Bar
c) Knot
d) Ohm
Answer »Answer: (b)
Question : 4
Which one of the following characteristics of the particle does the shaded area of the velocity-time graph shown represent?
a) Distance covered
b) Momentum
c) Acceleration
d) speed
Answer »Answer: (a)
The product of velocity and time if, the distance covered represents the area of the shaded portion.
Question : 5
How many watts are there in a horsepower?
a) 746
b) 1000
c) 750
d) 748
Answer »Answer: (a)
746 watts
A power level of 1 hp is approximately equivalent to 746 watts (W) or 0.746 kilowatts (kW). To convert from horsepower to watts, multiply by 746.
To convert from watts to horsepower, multiply by 0.00134.
Question : 6
The unit of the force is
a) Newton
b) Faraday
c) Fermi
d) Rutherford
Answer »Answer: (a)
The SI unit of force is the newton, symbol N.
Newton :
Newton, an absolute unit of force in the International System of Units (SI units), abbreviated N. It is defined as that force necessary to provide a mass of one kilogram with an acceleration of one metre per second per second.
Faraday :
A faraday is a dimensionless unit of electric charge quantity, equal to approximately 6.02 x 1023 electric charge carriers.
Fermi :
Fermi ('unit of measurement') is an SI unit of length equal to 10−15 metres, which means a quadrillionth of one metre. This distance is sometimes called a fermi and was so named in honour of Italian-American physicist Enrico Fermi, as it is a typical length-scale of nuclear physics.
Rutherford :
The rutherford (symbol Rd) is a non-SI unit of radioactive decay. It is defined as the activity of a quantity of radioactive material in which one million nuclei decay per second. It is therefore equivalent to one megabecquerel, and one becquerel equals one microrutherford.
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