Azeotropes

SCIENCE -QUIZ
CLASS-9

MOTION

1. What is the SI unit of speed?

km/h m/s cm/s m/h

2. Distance travelled per unit time is called:

Velocity Acceleration Speed Motion

3. Which quantity has both magnitude and direction?

Distance Speed Velocity Time

4. A body is said to be in motion if:

It changes its color It changes position with time It changes shape It becomes heavier

5. Which graph represents uniform motion?

Curved line Straight line Zig-zag line Circle

6. Velocity is:

Scalar quantity Vector quantity Unit quantity Constant quantity

7. The rate of change of velocity is called:

Speed Motion Acceleration Distance

8. SI unit of acceleration is:

m/s m/s² km/h cm/s²

9. Odometer measures:

Speed Velocity Distance Time

10. Speedometer measures:

Speed Distance Time Velocity

11. If displacement is zero, distance can be:

Zero only Negative Positive Infinite

12. The slope of a distance-time graph gives:

Acceleration Speed Velocity Force

13. Uniform acceleration means:

Unequal change in velocity Equal change in velocity in equal time intervals No change in velocity Zero speed

14. Rest and motion are:

Absolute Relative Constant Fixed

15. A car covers 100 km in 2 hours. Its average speed is:

40 km/h 50 km/h 60 km/h 70 km/h

16. Which of the following is a scalar quantity?

Velocity Acceleration Speed Displacement

17. The area under velocity-time graph represents:

Speed Acceleration Distance/Displacement Time

18. Negative acceleration is also called:

Speed Retardation Velocity Displacement

19. Which motion repeats itself after regular intervals?

Circular motion Periodic motion Random motion Uniform motion

20. Distance is a:

Vector quantity Scalar quantity Both None

21. Which graph shows acceleration?

Velocity-time graph slope Distance-time graph area Distance-time graph slope None

22. SI unit of displacement is:

m m/s km cm

23. Which quantity can be zero even when motion occurs?

Speed Distance Displacement Time

24. Motion in a straight line is called:

Circular motion Rectilinear motion Periodic motion Rotatory motion

25. The formula for average speed is:

Distance × Time Distance ÷ Time Time ÷ Distance Velocity × Time

FORCE AND LAWS OF MOTION

1. Which of the following can change the state of motion of an object?

Force Mass Energy Speed

2. SI unit of force is:

Joule Newton Watt Pascal

3. Newton's First Law is also known as:

Law of Gravitation Law of Inertia Law of Momentum Law of Motion

4. The tendency of a body to resist change in its state is called:

Velocity Acceleration Inertia Momentum

5. Which law explains action and reaction forces?

First Law Second Law Third Law Universal Law

6. Momentum is the product of:

Mass and force Velocity and acceleration Mass and velocity Force and acceleration

7. SI unit of momentum is:

kg m/s Newton Joule m/s²

8. An object at rest remains at rest until:

Time changes Force acts on it Temperature changes Mass increases

9. The rate of change of momentum is equal to:

Velocity Speed Force Mass

10. Which has more inertia?

A cricket ball A truck A bicycle A football

11. Force =

Mass × Velocity Mass × Acceleration Velocity × Time Mass ÷ Acceleration

12. Balanced forces can:

Change shape Change motion Increase speed Produce acceleration

13. Action and reaction forces act on:

Same object Different objects Same direction Same point

14. Inertia depends on:

Velocity Force Mass Shape

15. The law of conservation of momentum states:

Momentum increases always Momentum decreases always Total momentum remains constant Force remains constant

16. A force can change:

Shape only Direction only State of motion None

17. If no external force acts on a body, it will:

Stop automatically Continue in same state Accelerate Change direction

18. Which quantity is vector?

Speed Distance Momentum Time

19. Passenger falls backward when bus starts suddenly due to:

Friction Inertia Gravity Momentum

20. Newton’s second law relates force with:

Pressure Density Momentum Energy

21. Rocket moves upward because of:

First law Second law Third law Gravitation

22. The force opposing motion is:

Gravity Magnetic force Friction Muscular force

23. Momentum of a stationary object is:

Infinite One Zero Negative

24. Which law explains seat belts in cars?

Newton’s First Law Newton’s Second Law Newton’s Third Law Universal Law

25. Unit of acceleration is:

m/s kg N m/s²

WORK, ENERGY AND POWER

1. Work is said to be done when:

Force acts without displacement Displacement occurs without force Force causes displacement Object remains at rest

2. SI unit of work is:

Watt Newton Joule Pascal

3. Formula for work done is:

Force × Distance Mass × Velocity Force × Time Distance ÷ Time

4. Energy is the ability to do:

Force Work Power Motion

5. SI unit of energy is:

Joule Newton Watt Pascal

6. Which energy does a moving object possess?

Potential energy Heat energy Kinetic energy Chemical energy

7. Kinetic energy depends on:

Mass only Velocity only Mass and velocity Time

8. Energy possessed by an object due to its position is:

Kinetic energy Potential energy Mechanical energy Sound energy

9. SI unit of power is:

Joule Watt Newton Ampere

10. Power is the rate of doing:

Energy Motion Work Force

11. Formula for power is:

Work × Time Work ÷ Time Force × Distance Distance ÷ Velocity

12. Commercial unit of energy is:

Joule Watt Kilowatt-hour Newton

13. 1 kilowatt-hour equals:

3.6 × 10⁶ J 1000 J 3600 J 36 J

14. Work done is zero when:

Force is applied Displacement is zero Motion occurs Velocity increases

15. Potential energy depends on:

Position Speed Time Force only

16. Formula for kinetic energy is:

mv ½mv² mgh Fd

17. Formula for potential energy is:

½mv² mv mgh Pt

18. Which device converts electrical energy into mechanical energy?

Bulb Electric motor Heater Battery

19. A body at rest possesses:

Kinetic energy No energy Potential energy Sound energy

20. Mechanical energy is the sum of:

Heat and light energy Potential and kinetic energy Sound and heat energy Electrical and chemical energy

21. Which of the following has maximum kinetic energy?

Stationary car Moving truck Hanging stone Resting book

22. Power of a machine indicates:

Total work done Speed of doing work Energy stored Force applied

23. Which energy transformation occurs in a falling object?

Kinetic to potential Potential to kinetic Heat to light Sound to electrical

24. If force and displacement are in opposite directions, work done is:

Positive Negative Zero Infinite

25. One horsepower is approximately equal to:

746 W 100 W 1000 W 1 W

GRAVITATION

1. Who discovered the law of gravitation?

Albert Einstein Isaac Newton Galileo Archimedes

2. The force that attracts objects towards Earth is called:

Magnetic force Electrostatic force Gravitational force Frictional force

3. SI unit of gravitational force is:

Joule Newton Watt Pascal

4. The value of acceleration due to gravity on Earth is:

9.8 m/s² 98 m/s² 0.98 m/s² 8.9 m/s²

5. Weight of an object is the force with which:

Earth attracts the object Object attracts Earth Moon attracts object Air pushes the object

6. SI unit of weight is:

kg Newton Joule g

7. Mass of an object remains:

Constant Variable Zero Infinite

8. Weight of an object changes with:

Shape Position Color Temperature

9. Formula for weight is:

W = mg W = mv W = ma W = gh

10. SI unit of mass is:

Newton Joule Kilogram Gram

11. Objects fall towards Earth due to:

Friction Magnetism Gravity Pressure

12. Gravitational force between two objects depends on:

Their colors Their masses Their temperatures Their shapes

13. Gravitational force decreases when distance:

Decreases Increases Becomes zero Remains constant

14. The force of gravity on the Moon is about:

1/2 of Earth 1/6 of Earth Equal to Earth Double of Earth

15. The SI unit of density is:

kg/m³ g/cm³ N/m² kg

16. Density is defined as:

Mass × Volume Mass ÷ Volume Volume ÷ Mass Weight ÷ Volume

17. Thrust acting per unit area is called:

Force Pressure Weight Density

18. SI unit of pressure is:

Newton Joule Pascal Watt

19. Why do nails have pointed tips?

To decrease pressure To increase pressure To reduce mass To increase density

20. Buoyant force acts:

Downward Sideways Upward Horizontally

21. Archimedes’ principle deals with:

Gravitation Floatation Friction Motion

22. An object floats when:

Density is greater than liquid Density is less than liquid Weight is zero Mass is zero

23. The value of g on the Moon is:

More than Earth Equal to Earth Less than Earth Zero

24. Why do ships float on water?

Due to friction Due to buoyant force Due to pressure only Due to magnetism

25. Formula of pressure is:

Force × Area Area ÷ Force Force ÷ Area Mass × Area

Practice Questions, Science

Q1. Write the value of G in S.I. unit.

Q2.What will be the value of g at centre of the Earth?

Q3.State Newton's universal law of gravitation.

Q4.Write the differences between g and G.

Q5.Write the differences between mass and weight.

Q6.Write the differences between distance and displacement.

Q7.Write the differences between speed and velocity.

Q8.Define acceleration.

Q9.State Newton's first law of motion.

Q10.State Newton's second law of motion .

GRAVITATION

Q11. What are fluids?
Ans :Fluids are the substances that flow and lack a fixed shape, exert pressure in all directions and this pressure depends on the height of the fluid column above.

Q12. What is buoyant force ?
Ans: The upward force employed by a fluid which makes objects appear lighter when submerged, is called the buoyant force.
According to Archimedes' principle, the buoyant force equals the weight of the displaced fluid.

Q13. State Archimedes' principle.
Ans: Archimedes' principle states that whenever an object is immersed in a liquid (fully or partially), the liquid exerts on upward force upon the object.The amount of that force is equivalent to the weight of the liquid displaced by the object.

Q14. Write the applications of Archimedes principle.
Ans: (a) In evaluating relative density
(b) In designing ships and submarines.
(c) In making lactometers and hydrometers.

Q15. What is density?
Ans: Mass per unit volume of an object is called its density.
Density = Mass/volume

Q16. What is the S.I. unit of density?
Ans: kg/m₃

Q17. What is relative density ?
Ans: The ratio of density of a substance to the density of water is called relative density of the object.
Relative density = (density of substance)/(density of water)
Q18. What is the S.I. unit of relative density?
Ans : Relative density has no unit. It is a pure number.

Q19. Why is water chosen as a reference?
Ans: Water is present everywhere on the Earth so it becomes easier to evaluate the density of a substance in relation to water.

Q20. When an object sinks or floats in water?
Ans: If relative density of an object is greater than 1, it sinks in water.
If relative density of an object is less than 1 , it floats on water.

WORK AND ENERGY

1. When do we say that work is done?
   Ans : Work is said to be done when -
   (i) a force acts on an object, and
   (ii) the object is displaced.


2. Write an expression for the work done when a force is acting on an object in the direction of its displacement.
   Ans: Work done = force x Displacement
   or,
   W = F × S


3. Work done is scalar or vector?
   Ans: Scalar


4. What is the S.I. unit of work done?
   Ans: joule(J)


5. What is the C.G.S.. unit of work done?
   Ans: erg


6. Define 1 J of work.
   Ans: When a force of 1N causes a displacement of 1m in its own direction, then work done is said to be one joule.
   i.e., 1J = 1N × 1m = 1Nm


7. Define 1 erg of work.
   Ans: When a force of 1dyne causes a displacement of 1cm in its own direction, then work done is said to be one erg.
   i.e., 1erg = 1dyn × 1cm = 1dyn-cm


8. At what conditions work done can be zero?
   Ans: Work done is assumed zero when -
   (i)no force is applied.
   (ii) no displacement occurs.
   (iii)applied force and displacement be perpendicular to each other.


9. A pair of bullocks exerts a force of 140 N on a plough. The field being ploughed is 15 m long. How much work is done in ploughing the length of the field?
   Ans: Work done = F× s = 140 × 15 = 2100J


10. What is energy?
    Ans: The capacity of doing work is called energy.


11. What is mechanical energy?
    Ans: The energy stored to an object due to its motion or position is termed as mechanical energy.


12. What are the different types of mechanical energy?
    Ans: Two types of mechanical energy are -
    (i) Potential energy
    (ii) Kinetic energy


13. What is the kinetic energy of an object?
    Ans: The energy possessed by a body by virtue of its motion is called kinetic energy.


14. Write an expression for the kinetic energy of an object.
    Ans: Kinetic energy, E_k = 1/2 m v²
    where, m = mass of the object
    v = speed of the object


15. Can kinetic energy be negative?
    Ans: No kinetic energy can't be negative. It is always positive.


16. If velocity of an object be doubled , how many times will be the kinetic energy?
    Ans: 4 times


17. If velocity of an object be halved , how many times will be the kinetic energy?
    Ans: 1/4 times


18. If velocity of an object be doubled and its mass is done 4 times, how many times will be the kinetic energy?
    Ans: ......


19. certain force acting on a 20 kg mass changes its velocity from 5 m/s to 2 m/s. Calculate the work done by the force.
    Ans: ......


20. When will be the work done negative?
    Ans: ......
21. Define average power.
    Ans : When a machine or person does different amounts of work or uses energy in different interval of time , the ratio between the total work or energy consumed to the total time is average power.
22. A lamp consumes 1000J of electrical energy in 10s. What is its power ?
    Ans :- Power = W/t = 1000J / 10S = 100J/s = 100W.
23. A battery lights a bulb. Describe the energy change involved in the process.
    Ans :- A battery changes chemical energy into electrical energy. When current passes through filament , first electrical energy converts into heat energy and then into light energy .
24. A mass of 10 kg is at a point A on the table. It is moved to a point B. If the line joining A and B is horizontal , what is the work done on the objects by the gravitational force ? Explain your answer.
    Ans :- The work done is zero. This is because the gravitational force and displacement are perpendicular to each other.
25. The potential energy of a freely falling object decreases progressively. Does this violate the law of conservation of energy? Why?
    Ans :-It does not violate the law of conservation of energy. Whatever, the decrease in potential energy due to the loss of height , same is the increase in the kinetic energy due to increase in velocity of the body.
26. What are the various energy transformations that occur when you are riding a bicycle?
    Ans :- The chemical energy of the food changes into heat and then to muscular energy . On paddling, the muscular energy changes into the mechanical energy.
27. Does the transfer of energy take place when you push a huge rock with all your might and fail to move it ? Where is the energy you spend going ?
    Ans :- Energy transfer does not take place as no displacement takes place in the direction of applied force.The energy spent is used to overcome inertia of rest of the rock.
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