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11. Which of the following is a fundamental physical quantity?
A. Volume
B. Force
C. Time
D. None of these
ANSWER:C
SOLUTION :In physics, there are seven fundamental physical quantities that are measured in base or physical fundamental units:
length, mass, time, electric current, temperature, amount of substance, and luminous intensity.
12. Very small time intervals are accurately measure by which of the following?
A. Atomic clocks
B. Quartz clocks
C. Stop watch
D. None of these
ANSWER:A
SOLUTION:Atomic clocks are the most accurate way to measure very small time intervals, such as nanoseconds (10^( 9) seconds).
13. Knot is a unit of which of the following?
A. Speed of Ship
B. Speed of Aeroplane
C. Speed of waves
D. None of these
ANSWER:A
SOLUTION:A knot is a unit of speed used to measure the speed of ships and aircraft. One knot is equal to one nautical mile per hour, or 1.852 kilometers per hour.
14. What is the unit of electric current?
A. Coulomb
B. Ampere
C. Ohm
D. None of these
ANSWER:B
SOLUTION:The unit of electric current in the International System of Units (SI) is the ampere, represented by the symbol “A”. One ampere is the flow of one coulomb of electricity per second across a surface.
15. What is the unit of energy in MKS system?
A. Joule
B. Volt
C. Watt
D. None of these
ANSWER:C
SOLUTION:Atmospheric pressure. Pressure (P): The force per unit area is called pressure. The SI unit of pressure is the pascal (Pa) or N/m2. The metric unit of pressure is the bar.
16. Which of the following is expressed as force per unit area?
A. Work
B. Energy
C. Pressure
D. None of these
ANSWER:C
SOLUTION :Pressure: It is defined as Force acting per unit area.
17. What is the SI unit of electric charge?
A. Coulomb
B. Meters
C. Decibel
D. None of these
ANSWER:A
SOLUTION:The SI unit of electric charge is the coulomb.
18. 1 nanometer is equal to _______.
A. 10-9 m
B. 10-8 m
C. 10-7 m
D. None of these
ANSWER:A
SOLUTION: 1 nanometer = 10-9 m = 10+2 × 10-9 cm = 10-7 centimeter.
19. 1 kilometer is equal to how many miles?
A. 0.50
B. 0.60
C. 0.62
D. 0.01
ANSWER:C
SOLUTION: To convert kilometers to miles, we need to know the conversion factor. The conversion factor for kilometers to miles is 1 kilometer = 0.621371 miles. Hence, one kilometer is equal to 0.621371 miles.
20. Dimensions of kinetic energy is same as that of ________.
A. Work
B. Force
C. Wave
D. None of these
ANSWER:A
SOLUTION:The dimensions of kinetic energy are the same as those of work.