Science Class 8th
441. The pH of weakest alkali will be:
A) 0
B) 14
C) 6.9
D) 7.1
442. The colour of phenolphthalein in acidic medium is:
A) Red
B) Yellow
C) Blue
D) Colorless
443. Completion of reaction some time can be observed using:
A) Acid
B) Alkali
C) Salt
D) Indicator
444. Baking Soda is:
A) Salt
B) Alkalis
C) Acid
D) Indicators
445. Force is a ______.
A) Push
B) Pull
C) Both A and B
D) None of the above
446. The SI unit of Force is:
A) Kg
B) N
C) m
D) None of the above
447. 1N= 1kgm-2
A) True
B) False
448. _____ is the space where force is applied;
A) Diameter
B) Area
C) Perimeter
D) None of the above
449. The Product of the length and the width of an object:
A) Diameter
B) Area
C) Perimeter
D) None of the above
450. The SI unit of Area is:
A) kg
B) m2
C) N
D) none of the above
451. _____ is defined as perpendicular force applied on a unit surface area of a body.
A) Force
B) Pressure
C) Gravity
D) None of the above
452. Unit Of Pressure is Pascal:
A) True
B) False
453. Which of the following protects the eye from damage:
A) Blood
B) Retina
C) Liquid Pressure
D) None of the above
454. Air is _____ dense than Water and thus exerts ____ pressure.
A) Less, less
B) Less, more
C) More, Less
D) More, more
455. Pressure applied on a liquid in closed container is transferred equally in all directions throughout the liquid.
A) Charles Law
B) Boyle Law
C) Pascal Law
D) Archimedes Principle
456. The Brakes of a vehicle works on the hydraulic principle.
A) True
B) False
457. The Service Stations use manual presses to lift the cars:
A) True
B) False
458. The study of behavior of ____ under pressure is called Pneumatics:
A) Liquids
B) Gases
C) Solids
D) Plasma
459. The Pressure of the gas depends on which of the following:
A) Quantity
B) Temperature
C) Both A and B
D) None of the above
460. If the Temperature of a gas increase, the pressure shall:
A) Decrease
B) Increase
C) Remain Same
D) Increase but then shall decrease