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