1. Science-10 Unit- Physics (New course)

When a body falling without any external resistance towards the surface of the heavenly body is called...

• acceleration due to gravity

• Weightlessness

• Free falling

• Gravitational force

What will be the pressure exerted by a column of mercury in barometer. If the height of the mercury column is 76 cm and density is 13.6 g/cm^3?

• 10129 Pa

• 7448 Pa

• 101293 Pa

• 10336 Pa

Why the tyre of tractor is made wider then tyre of car?

• For reduction of pressure

• For reduction of upthrust

• For reduction of density

• For reduction of Area

Find out the acceleration due to gravity at the distance of 10^7 m from center of the earth. The mass of the earth is 6×10^24 kg and radius is 6.4×10^6m.

• 9.77 m/s^2

• 4.002 m/s^2

• 9.8 m/s^2

• 1.48 m/s^2

In which condition, does a substance having greater density than water float on it?

• If it displaces water equal to its own weight.

• If its surface area is decreased.

• If its weight is decreased.

• If it is pressed.

In which principle the lactometer is based on?

• Pascal's law

• Archimedes Principle

• Law of floatation

• Law of gravitational force

What would be the force of attraction between two objects if mass of both bodies are made double?

• 4 times

• 2 times

• 6 times

• 8 times

What is the conclusion of the experiment coin and feather?

• Coin falls faster than feather.

• If there is no external resistance everybody falls simultaneously.

• Coin falls slower than feather.

• Feather falls slower than coin.

On which principle does a hydraulic machine base on?

• Law of atmospheric pressure

• Law of flotation

• Archimedes Principle

• Pascal's law

Which instrument is used to measure atmospheric pressure?

• Manometer

• Pressure Gauge

• Barometer

• Thermometer