**Physics ****Class 9 ^{th} **

**Objective (2019)**

(1) Which one of the following units is not a derived unit?

(A) Pascal

(B) Kilogramme

(C) Newton

(D) Watt

(2) Which of the following is a vector quantity?

(A) Speed

(B) Distance

(C) Displacement

(D) Power

(3) Inertia depends upon:

(A) Mass

(B) Force

(C) Net force

(D) Velocity

(4) The S.I unit of weight is:

(A) Watt

(B) Kilogramme

(C) Gramme

(D) Newton

(5) The number of perpendicular components of a force are:

(A) 1

(B) 2

(C) 3

(D) 4

(8) Earth’s gravitational force of attraction vanishes at:

(A) Infinity

(B) 6400 km

(C) 42300 km

(D) 4000 km

(7) One horse power is equal to:

(A) 674 watt

(B) 746 watt

(C) 647 watt

(D) 110 watt

(8) In Einstein’s mass-energy equation “C” is the:

(A) Speed of sound

(B) Speed of Earth

(C) Speed of electron

(D) Speed of light

(9) S.l unit of pressure is Pascal which is equal to:

(A) 10^{4}Nm^{-2}

(8) 1 Nm^{-2}

(C) 10^{2}Nm^{-2}

(D) 10^{3}Nm^{-2}

(10) Co-efficient of volume thermal expansion of Brass is:

(A) 6.0.x 10^{-5}K^{-1}

(B) 2.4x 10^{-5}K^{-1}

(C) 7.2x 10^{-5}K^{-1}

(D) 4.2x 10^{-5}K^{-1}

(11) Thermal conductivity of Copper is:

(A) 0.026 wm^{-1}k^{-1}

(B) 400 wm^{-1}k^{-1}

(C) 0.6 wm^{-1}k^{-1}

(D) 105 wm^{-1}k^{-1}

(12) Which of the following is a good radiator of heat?

(A) A white surface

(B) A shining silvered surface

(C) A green coloured surface

(D) A dull black surface

**Subjective (2019) | ****Short Questions**

- Define Nuclear Physics and Plasma Physics.
- Estimate 14 years age in seconds?
- What is meant by Vernier Constant?
- Differentiate between Scalars and Vectors.
- Write two types of Motion.
- White two differences between Mass and Weight.
- Define Friction and Coefficient of Friction.
- Define Force. What is the unit of force in S.I?
- Define Like and Unlike parallel forces.
- Differentiate between centre of mass and centre of gravity
- State the Law of Gravitation.
- What is meant by Field Force?
- What are Satellites? Give one example.
- Write unit of work and define this unit also.
- What is meant by Nuclear Fuels?
- Define Power. Write its formula.
- Write important features of Kinetic molecular model of a matter.
- Define Density. What is its St unit?
- State Pascal’s law and write the name of its two applications.
- Define Temperature and write ts SI Unit.
- What is meant by upper and lower fixed point of Thermometer?
- What is meant by transfer of heat?
- What is meant by rate of flow of heat? Write its equation.
- What is Styrofoam? Write its one use.

**Long Questions**

- Derive third equation of motion with the help of speed-time graph.
- How much time is required to change 22 Ns momentum in a body by a force 20 N?
- Define Centre of gravity. how can you find the Centre of gravity of an irregular shaped thin lamina?
- A motor boat moves at a steady speed of 4 ms-1. Water resistance acting on it is 4000 N Calculate the power of its engine.
- Define Evaporation. Write the various factors affecting it.
- A cube of glass of 5 cm side and mass 306 g. has a cavity inside it. If the density of glass 15 255 gem-3? Find the volume of the cavity.

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