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21. How many Dynes are there in 1 gram weight ?
A. 981
B. 999
C. 975
D. 908
ANSWER:A
SOLUTION :There are 981 dynes in one gram weight.
22. Pascal is a unit of which of the following?
A. Pressure
B. Thrust
C. Work
D. None of these
ANSWER:A
SOLUTION:The pascal (Pa) is the International System of Units (SI) unit of pressure or stress. It is named after the scientist and mathematician Blaise Pascal.
23. 1 kilogram equals to how many pounds_________.
A. 2.2
B. 2
C. 5
D. None of these
ANSWER:A
SOLUTION:A kilogram is abbreviated as kilo or kg. A pound is equal to 0.4535 kilograms. One kilogram is equal to 2.2046 pounds.
24. What is the SI unit of Intensity of illumination ?
A. Lux
B. Flux
C. Centimetre
D. None of these
ANSWER:A
SOLUTION:Lux is the unit of illuminance or luminous intensity.
25. 1 Inch equals to how many centimeter?
A. 2.50
B. 2.54
C. 3.5
D. 2.75
ANSWER:B
SOLUTION:2.54 CM
26. Velocity of wind is measured by __________.
A. Anemometer
B. Speedometer
C. Hygrometer
D. None of these
ANSWER:A
SOLUTION :An anemometer is an instrument that measures wind speed and direction. It’s a common tool for meteorologists who study weather patterns.
27. What is the use of telescope?
A. Viewing Near objects
B. Viewing distance objects
C. Viewing Living cells
D. None of these
ANSWER:B
SOLUTION:Telescopes are used to view distant objects by collecting and analyzing radiation from them.
28. What is the S.I Unit of temperature?
A. Kelvin
B. Centigrade
C. Fahrenheit
D. None of these
ANSWER:A
SOLUTION: The kelvin (K) is the International System of Units (SI) unit of temperature. It’s a thermodynamic unit that’s equal to 1/273.16 of the triple point of water’s thermodynamic temperature, or -273.15°C. The kelvin scale starts at absolute zero, which is the coldest possible temperature.
29. The energy of food is measured in __________.
A. Calories
B. Kelvin
C. Joule
D. None of these
ANSWER:A
SOLUTION: Amount of energy in a food is measured in calories. One calorie is defined as the amount of heat energy required to increase the temperature of one gram of water by one degree Celcius.
30. Which of the following is not a unit of time?
A. Nano second
B. Second
C. Light year
D. None of these
ANSWER:C
SOLUTION:A light year is not a unit of time, but a unit of distance. It is the distance light travels in a vacuum in one year, which is equal to 9.467 x 10^15 meters. Light years are used in astronomy to measure the distance of nearby stars.