Science Class 8th
461. Squeezing of Gas Particles so they take up less space:
A) Expansion
B) Compression
C) Inflation
D) Deflation
462. “ For a given mass of a gas, Volume V and Pressure P are inversely proportional to each other at the constant temperature”
A) Charles Law
B) Boyle Law
C) Archimedes Law
D) None of the above
463. A(n) _______ is a suspension of tiny liquid particles in a gas or air
A) Spray
B) Aerosol
C) Compressed Gas
D) None of the above
464. Air is a mixture of liquids.
A) True
B) False
465. Area existing around the earth is called:
A) Lithosphere
B) Atmosphere
C) Exosphere
D) Mesosphere
466. Atmosphere is made up of mainly:
A) Oxygen
B) Hydrogen
C) Chlorine
D) Nitrogen
467. The Composition of Nitrogen in the air is:
A) 50 %
B) 34 %
C) 78%
D) None of the above
468. The Percentage of Oxygen in the air is:
A) 50 %
B) 21%
C) 34 %
D) None of the above
469. Which of the following is not present in the air:
A) Neon
B) Krypton
C) Xenon
D) None of the above
470. The Atmosphere also exerts pressure on the earth.
A) True
B) False
471. Where is the air density maximum:
A) At the Moon
B) Mount Everest
C) Underwater
D) Sea level
472. Atmospheric Pressure at Peshawar is _____ than at Murree.
A) Lesser
B) Greater
C) Equal
D) Hard To Say.
473. Wind is due to:
A) Difference in the Air Pressure
B) Difference in the Weight
C) Difference in Altitude
D) None of the above
474. CFCs are helpful for the Ozone layer.
A) True
B) False
475. The Unit of Pressure is:
A) N
B) m2
C) Pa
D) m/s2
476. The pressure at any point in a liquid depends upon:
A) Dept of the point
B) Area of the mouth of the vessels
C) Area of the bottom of the vessels
D) The Thickness of the vessel.
477. The Percentage of Oxygen in the air is:
A) 78%
B) 50%
C) 33%
D) 21%
478. The SI unit of area is:
A) m
B) m2
C) m3
D) N
479. The Formula of pressure, P:
A) F x A
B) F/A
C) A/F
D) F x d
480. Which of the following is not a rare gas:
A) Krypton
B) Xenon
C) Ozone
D) Radon