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Q1. A force of 5 N acts on a mass of’ 1 kg which acquire 40 m/s. What is the time for which the force acts?
Correct answer : 1
Q2. A force of 4 N acted on a small body and pushed it vertically upwards. Simultaneously, another force of 7 N acted on it and pushed it vertically down wards. What is the resultant of the two forces? [Resultant = 7 – 4 = 3N]
Correct answer : 3
Q3. A fly wheel has angular velocity of 20 p rad S–1 in 5 sec, then the angular displacement is
Correct answer : 3
Q4. A dynamo is used to produce ...... current using .....
Correct answer : 3
Q5. A dynamo is an instrument that produces ........ current using
Correct answer : 3
Q6. A distance - time graph is parallel to X-axis.What is shows?
Correct answer : 3
Q7. A direct current consists of ...........
Correct answer : 1
Q8. A detailed study of natural radioactivity forms the basis of ...........
Correct answer : 4
Q9. A cylindrical coil of wire is called
Correct answer : 2
Q10. A current is flowing in a curricular loop of wire in clock-wise direction. The magnetic field at the centre of the wire is
Correct answer : 2
Q11. A current carrying conductor is placed normal to the magnetic field directed towards east. The electrons in the conductor are moving from north to south. What is the direction of the force acting on the conductor?
Correct answer : 2
Q12. A copper plate is heated to 200 degree C. It cools by emitting
Correct answer : 4
Q13. A convex lens of focal length 0.5 m and concave lens of focal length 1 m are combined. The power of the resulting lens will be
Correct answer : 1
Q14. A convex lens can form .............. image
Correct answer : 3
Q15. A concave mirror of focal length 20cm is dipped in a liquid of refractive index 1.67, then the focal length is ............ cm. hint : (focal length does not depend on the medium where it is placed.)
Correct answer : 2
Q16. A coin is placed at the bottom of a bowl and water is poured into it. How does the coin appear and what is it due to?
Correct answer : 2
Q17. A charged particle moving in a magnetic field experiences a resultant force
Correct answer : 3
Q18. A chain reaction is possible when the mass of the fuel is greater than .............
Correct answer : 3
Q19. A cart is pulled along the road for a distance of 5m. If the average frictional force is 47N, then what is the work done? [W = F × S]
Correct answer : 2
Q20. A car is moving at a speed of 72 km/h, what is its speed?
Correct answer : 4
Q21. A car goes around a curve. The centripetal force is directed
Correct answer : 1
Q22. A car goes 10 km north and 20 km east. What will be the displacement from initial point?
Correct answer : 3
Q23. A bus covers a distance of 2,924 kms in 43 hrs. What is the speed of the bus?
Correct answer : 1
Q24. A bullet fired from a gun is an example of ....... motion
Correct answer : 3
Q25. A boy is. standing at a distance of 12.5 m before the mirror. He walks 3.5m towards the mirror, what is the distance between the new position of the boy and his image formed by the mirror?
Correct answer : 1
Q26. A body of mass 5 kg is taken from a height 8 m to 12 m. The ‘increase in P.E (g = 10m/ S2) is
Correct answer : 2
Q27. A body floats in a liquid if the buoyant force is
Correct answer : 4
Q28. A blotting paper absorbs ink because of
Correct answer : 4
Q29. A body at rest breaks into two pieces of equal masses. The parts will move
Correct answer : 3
Q30. A beam of a-particles enter a chamber moving along the magnetic field. What is the force acting on them?
Correct answer : 3
Q31. A ball is thrown vertically up, what is the velocity at its maximum height?
Correct answer : 2
Q32. A ball is dropped from a height H. When it reaches the ground. its velocity is 20 m/s. What is the height H
Correct answer : 1
Q33. A ball dropped from the top of the building at a height of 45.6m strikes the ground with velocity
Correct answer : 3
Q34. A 5 cm long conductor carrying 8 A current is placed in a magnetic field of induction 2 T, making an angle 30 degree with the field. What is the force acting on the conductor?
Correct answer : 4
Q35. A 200 W bulb is used for 5 hrs energy consumed is
Correct answer : 4
Q36. A 250 W computer is switched on for 4 hrs. How many units of electricity does it use?
Correct answer : 2
Q37. A 2 KW electric wire is switched on for 30 minutes. How many units of electricity does it use?
Correct answer : 3
Q38. A 2 × 103 kg car travels at a constant speed of 12 ms–1 around a circular curve of radius 30m. what is the magnitude of the centripetal acceleration of the car? [a = u2/r]
Correct answer : 2
Q39. A 120 kg car moving at 10m/s hits a tree and is brought to rest in 0.10 s. What is the magnitude of the average force acting on the car to bring it to rest?[Impulse = change in momentum; Ft = mv; F = mv/t]
Correct answer : 3
Q40. 550 KHz - 1600 KHz is the frequency range of which region?
Correct answer : 3
Q41. 1A is equal to
Correct answer : 3
Q42. 10A of current is established in a conducting wire. What. is the time taken for 20C of charge to flow through it ?
Correct answer : 1
Q43. 10 joule of work is done in moving a charge of 0.1 c between two points of current carrying conductor. What is the potential difference between these two points?
Correct answer : 3
Q44. 1 tesla is equal to ...........
Correct answer : 1
Q45. 1 million electrons are crossing through a cross section of a conductor in 1 milli second. The current flowing through the conductor is
Correct answer : 1
Q46. 1 kwh is equal to ...........
Correct answer : 3
Q47. 1 HP (horse power) equals to
Correct answer : 3
Q48. 1 kg of cotton and 1 kg of iron are weighed in vacuum then
Correct answer : 3
Q49. 1 Å is equal to what?
Correct answer : 3
Q50. Which of the following responsible for admitting different amounts of light into eye?