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1 : Two metal plates of area 2 and 3 square metres are placed in a liquid at the same depth. The ratio of pressures on the two plates is:

1 : 1:1

2 : √2:3

3 : 2:3

4 : 4:9

2 : The principle of a hydraulic press is based on:

1 : Hooke's law

2 : Pascal's law

3 : Principle of conservation of energy

4 : Principle of conservation of momentum

3 : When a spring is compressed, what form of energy does it possess?

1 : Kinetic

2 : Potential

3 : Internal

4 : Heat

4 : A wire is stretched by a weight w. If the diameter of the wire is reduced to half of its previous value, the extension will become:

1 : one half

2 : double

3 : one fourth

4 : four times

5 : Four wires of the same material are stretched by the same load. Their dimensions are given below. Which of them will elongate most?

1 : Length 1 m, diameter 1 mm

2 : Length 2 m, diameter 2 mm

3 : Length 3 m, diameter 3 mm

4 : Length 4 m, diameter 0.5 mm

6 : The pressure at any point in a liquid is proportional to:

1 : density of the liquid

2 : depth of the point below the surface of the liquid

3 : acceleration due to gravity

4 : all of the above

7 : What is the force exerted by the atmosphere on a rectangular block surface of length 50 cm and breadth 40 cm? The atmospheric pressure is 100 kPa.

1 : 20 kN

2 : 100 kN

3 : 200 kN

4 : 500 kN

8 : Pressure applied to an enclosed fluid is:

1 : increased and applied to every part of the fluid

2 : diminished and transmitted to the walls of container

3 : increased in proportional to the mass of fluid and then transmitted to each part of the fluid

4 : transmitted unchanged to every portion of the fluid and walls of containing vessel

9 : What is a hook ‘s Law?

1 : F=mv

2 : F=kx

3 : E=mc

4 : P=IV

10 : Which of the following is a cause the deformation of solids?

1 : Temperature

2 : External

3 : Change in density

4 : All of above

11 : Which of the following has the highest density?

1 : Water

2 : Oil

3 : Lead

4 : Air

12 : What is the unit of spring constant K?

1 : N/m

2 : kg/m

3 : m/N

4 : Ns/m

13 : What is unit of density?

1 : kg/m^3

2 : g/cm^3

3 : kg/L

4 : All of above

14 : What is the density of water?

1 : 800kgm^-3

2 : 1000kgm^-3

3 : 2400kgm^-3

4 : 2000kgm^-3

15 : What is the density of Air?

1 : 1.8kgm^-3

2 : 3.6kgm^-3

3 : 2.7kgm^-3

4 : 1.3kgm^-3

16 : Which of the following devices uses Hooke‘s law to measure weight?

1 : Balance

2 : Spring scale

3 : Thermometer

4 : Barometer

17 : What is equivalent of 1 atm in millibar mercury?

1 : 10.13kPa

2 : 101.3kPa

3 : 1014kPa

4 : 1.013kPa

18 : In an open manometer what is compared to measure of gas?

1 : Atmosphere pressure

2 : Absolute zero

3 : Gas flow rate

4 : Gravitational force E)

5 : Gas flow rate

19 : What type of fluid commonly used in manometer?

1 : Water

2 : Mercury

3 : oil

4 : All of above

20 : Why is the edge of chopper blade made very sharp?

1 : To reduce pressure

2 : To increase pressure

3 : To change direction of forces

4 : To reduce the force applied

21 : What is the formula for pressure?

1 : P=F/A

2 : P=FxA

3 : P=F+A

4 : P=F-A

22 : What is density?

1 : Mass per unit volume

2 : Volume per unit mass

3 : Area per unit mass

4 : Area perunitmass

23 : A 50 N force stretches a spring by 0.1m .What is the spring constant?

1 : 100N/m

2 : 500N/m

3 : 1000N/m

4 : 5000N/m

24 : What happen to pressure when when force is applied to small area?

1 : Decrease

2 : Increase

3 : Become

4 : Remain the same

25 : Which of the following devices works based on parcel’s law?

1 : Hydraulic press

2 : bicycle pump

3 : Venture meter

4 : them meter

26 : What unit of commonly used to measure atmospheric pressure?

1 : Joule

2 : Pascal

3 : Watts

4 : Kilograms

27 : What is typical operating pressure in a hydraulic brake system?

1 : 100Pa

2 : 1,00Pa

3 : 100KPa

4 : 100,000KPa

28 : Which of the following is an example of partial application of a hydraulic?

1 : Lifting car for repair

2 : Blowing air into tries

3 : Pumping water

4 : Electricity in dam

29 : Pressure in liquid Pressure is equal to :

1 : Phg

2 : Pgh

3 : P/d

4 : P/hq

30 : In a motor type the pressure is :

1 : 2x10^5 Pa

2 : 2x10”Pa

3 : 4x10^4vPa

4 : 7x10^2 Pa

31 : Which principle does a hydraulic breaks system perature on?

1 : Bernoulli’s principle

2 : Pascal law

3 : Archimedes’ principle

4 : Newton laws

32 : Atmospheric pressure at a location depends on?

1 : Temperature

2 : Altitude

3 : Temperature

4 : Humidity only

33 : Hooke’s law is used in which of the following applications?

1 : Mechanical clocks

2 : Electrical circuits

3 : Hydraulic system

4 : All of above

34 : What is a manometer used to measure?

1 : Temperature

2 : Pressure

3 : Humidity

4 : Velocity

35 : Which of the following is NOT an application of Hook’s Law?

1 : Suspension system

2 : Galvanometer

3 : Microscope

4 : Door hinges

36 : Which of the following component of hydraulic press?

1 : Piston

2 : Brake pads

3 : Fuel tang

4 : Spark plug

37 : What is formual for pressure according to Pascal’s law?

1 : P=F/A

2 : P=V/T

3 : P=mg

4 : P=A/F

38 : Which principle is used in the working of a manometer?

1 : Newton ‘s

2 : Emboli’s principle

3 : Pascal ‘s law

4 : Boyle’s law

39 : Which instrument is used to measure atmosphere pressure?

1 : Thermometer

2 : Barometer

3 : Hydrometer

4 : Ammeter

40 : What is the average atmosphere pressure at sea level?

1 : 1010 millibar

2 : 1013.25 millibar

3 : 100 millibar

4 : 900 millibar

41 : What is the equivalent of 1 atm in millibar mercury?

1 : 760 mm Hg

2 : 76 mm Hg

3 : 7.6 mm Hg

4 : 7600mmHg

42 : What is the pressure at the top Mount Everest as compared to sea level?

1 : Higher than sea liver

2 : Equal than sea level

3 : Lower than sea level

4 : It fluctuates constantly

43 : Which of the following best describes applications of Pascal‘s law?

1 : Hydraulic press

2 : Syringes

3 : Air plane wing design

4 : Hydraulic brake

44 : What is the primary function of hydraulic brakes?

1 : To increase the vehicle speed

2 : To reduce the vehicle fuel

3 : To slow down or stop a vehicle

4 : To maintain a constant speed

45 : Which of the following best describe the applications of Pascal‘s law?

1 : gases

2 : At applies only to only solids

3 : It applies to both liquid and solids

4 : It applies only in vacuum

46 : Which of the following component is NOT part of a hydraulic brake system?

1 : Brake fluid

2 : brake pads

3 : piston

4 : Spark plug

Physics 9th MCQs || Ilam Ghar