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MCQ Questions for Class 9 Science with Answers Physics
Q1. In case of negative work, the angle between the force and displacement is:
(i) 0°
(ii) 45°
(iii) 90°
(iv) 180°
(iv) 180°
Q2. When a body falls freely towards the earth, then its total energy
(i) Decreases
(ii) Increases
(iii) First increases and then decreases
(iv) Remains constant
(iv) Remains constant
Q3. A girl is carrying a school bag of 3 kg mass on her back and moves 200 m on a levelled road. The work done against the gravitational force will be (g = 10 ms²)
(i) 6 × 10³ J
(ii) 6 J
(iii) 0.6 J
(iv) zero
(iv) zero
Q4. When a body falls freely towards the earth, then its total energy
(i) Decreases
(ii) Increases
(iii) First increases and then decreases
(iv) Remains constant
(iv) Remains constant
Q5. Which of the following does not possess the ability to do work not because of motion ?
(i) a sparrow flying in the sky
(ii) a sparrow moving slowly on the ground
(iii) a sparrow in the nest on a tree
(iv) a squirrel going up a tree
(iii) a sparrow in the nest on a tree
Q6. Which one of the following is not the unit of energy?
(i) Joule
(ii) Newton meter
(iii) Kilowatt
(iv) Kilowatt hour
(iii) Kilowatt
Q7. The momentum of a bullet of mass 20 g fired from a gun is 10 kg m/s. The kinetic energy of this bullet in kJ will be:
(i) 25
(ii) 2.5
(iii) 0.25
(iv) 5
(ii) 2.5
Q8. The work done on an object does not depend upon the
(i) displacement
(ii) force applied
(iii) angle between force and displacement
(iv) initial velocity of the object
(iv) initial velocity of the object
Q9. Work done by a body is
(i) negative, positive or zero
(ii) always positive
(iii) always zero
(iv) always negative
(i) negative, positive or zero
Q10. The momentum of a bullet of mass 20 g fired from a gun is 10 kg.m/s. The kinetic energy of this bullet in kJ will be :
(i) 5
(ii) 1.5
(iii) 2.5
(iv) 25
(iii) 2.5
Q11. The capacity of a body to perform work is called:
(i) Energy
(ii) Work
(iii) Power
(iv) Heat
(i) Energy
Q12. A body is falling from a height h. After it has fallen to a height of h/2, it will possess:
(i) Only kinetic energy
(ii) Half kinetic and half potential energy
(iii) Only potential energy
(iv) More kinetic and less potential energy
(iv) More kinetic and less potential energy
Q13. If speed of a car becomes 2 times, its kinetic energy becomes
(i) 4 times
(ii) 8 times
(iii) 16 times
(iv) 12 times
(i) 4 times
Q14. When speed of the moving object is doubled its
(i) Acceleration is doubled
(ii) Momentum becomes four times more
(iii) K E. is increased to four times
(iv) Potential energy is increased
(iii) K E. is increased to four times
Q15. The capacity to perform work is obtained from :
(i) Food
(ii) Energy
(iii) Power
(iv) All of these
(ii) Energy
Q16. The work done on an object does not depend upon the:
(i) Angle between force and displacement
(ii) Force applied
(iii) Initial velocity of the object
(iv) Displacement
(iii) Initial velocity of the object
Q17. Work done by friction
(i) increases kinetic energy of body
(ii) decreases kinetic energy of body
(iii) increases potential energy of body
(iv) decreases potential energy of body.
(ii) decreases kinetic energy of body
Q18. What is the commercial unit of energy?
(i) electron volt
(ii) W/s
(iii) kW h
(iv) joule
(iii) kW h
Q19. What is the energy possessed by an object due to its motion?
(i) Potential energy
(ii) Electrical energy
(iii) Kinetic energy
(iv) None of them
(iii) Kinetic energy
Q20. A microphone converts:
(i) Sound energy into mechanical energy in stereo system
(ii) Sound energy into electrical energy in public address system
(iii) Electrical energy into sound energy in ordinary telephone
(iv) Microwave energy into sound energy in a mobile phone
(ii) Sound energy into electrical energy in public address system
Q21. One joule work is said to be done when
(i) a force of 1 N displaces a body by 1 cm
(ii) a force of 1 N displaces a body by 1 m
(iii) a force of 1 dyne displaces a body by 1 m
(iv) a force of 1 dyne displaces a body by 1 cm.
(ii) a force of 1 N displaces a body by 1 m
Q22. According to the law of conservation of energy
(i) Energy can’t be destroyed
(ii) Energy can’t be created
(iii) Energy can be transformed from one from to another
(iv) All of the above
(iv) All of the above
Q23. Mechanical energy of a body includes
(i) kinetic energy only
(ii) potential energy only
(iii) kinetic energy and potential energy
(iv) none of these
(iii) kinetic energy and potential energy
Q24. In the SI system, the unit of potential energy is
(i) newton
(ii) joule
(iii) watt
(iv) metre per second
(ii) joule
Q25. 9800 joule of energy was spent to raise a mass of 50kg, the mass was raised to a height of
(i) 20m
(ii) 980m
(iii) 10m
(iv) none of these
(i) 20m
Q26. Potential energy and kinetic energy are types of
(i) Electrical energy
(ii) Magnetic energy
(iii) Thermal energy
(iv) Mechanical energy
(iv) Mechanical energy
Q27. In which case work is not done:
(i) A girl swimming in a pond
(ii) A windmill lifting water from a well
(iii) A standing man holding a suit case in his hand
(iv) A sail boat moving in the direction of wind
(iii) A standing man holding a suit case in his hand
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