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PHYSICS TEST

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1. I. Its velocity is constant II. No work is done on the body III. It has constant acceleration directed away from the centre IV. The centripetal force is directed towards the centre  Which combination of the above is true of a body moving with constant speed in a circular track?

 

 

 

 

2. A stream is flowing at 0.75ms-1 and a boat heading perpendicular for the stream landed at the opposite bank at an angle of 30°. Calculate the velocity of the boat

 

 

 

 

3. At what frequency would a 10H inductor have a reactance of 2000Ω?

 

 

 

 

4. If a sound wave goes from a cold air region to a hot air region, its wavelength will

 

 

 

 

5. a lead bullet of mass 0.05kg is fired with a velocity of 200ms-1 into a lead block of mass 0.95kg. Given that the lead block can move freely, the final kinetic energy after impact is

 

 

 

 

6. When a ship sails from salt water into fresh water, the fraction of its volume above the water surface will

 

 

 

 

7.

If the stress on a wire is 107NM-2 and the wire is stretched from its original length of 10.00 cm to 10.05 cm. The young’s modulus of the wire is

 

 

 

 

8. When temperature of a liquid increases, its surface tension

 

 

 

 

9. An astronomical telescope is said to be in normal adjustment when the

 

 

 

 

10.

The temperature gradient across a copper rod of thickness 0.02m, maintained at two temperature junctions of 20°C and 80°C respectively is

 

 

 

 

11. Which of the following electromagnetic waves is least energetic?

 

 

 

 

12. The inner diameter of a test tube can be measured accurately using a

 

 

 

 

13. Calculate the mass of ice that would melt when 2kg of copper is quickly transferred from boiling water to a block of ice without heat loss;
Specific heat capacity of copper = 400JKg-1K-1
Latent heat of fusion of ice = 3.3 x 105JKg-1

 

 

 

 

14. Two bodies have masses in the ratio 3:1. They experience forces which impart to them acceleration in the ratio 2:9 respectively. Find the ratio of forces the masses experienced.

 

 

 

 

15. in a series R-L-C circuit at resonance, the voltages across the resistor and the inductor are 30V and 40V respectively, what is the voltage across the capacitor?

 

 

 

 

16. A man stands 4m in front of a plane mirror. If the mirror is moved 1m towards the man, the distance between him and his new image is

 

 

 

 

17. Steel is more suitable for permanent magnet than iron because the former

 

 

 

 

18. The core of an efficient transformer should consist of laminated pieces of metal in order to

 

 

 

 

19. What is the speed of a particle of mass 10-27kg whose wavelength is 10-8m.

[h = 6.63 x 10-34Js]

 

 

 

 

20. The inside portion of part of a hollow metal sphere of diameter 20cm is polished. The portion will therefore form a

 

 

 

 

21. A piece of substance of specific head capacity 450JKg-1K-1 falls through a vertical distance of 20m from rest. Calculate the rise in temperature of the substance on hitting the ground when all its energies are converted into heat. [g = 10ms-2]

 

 

 

 

22. A 3000W electric cooker is to be used on a 200V mains circuit. Which of the fuses below can be used safely with the cooker?

 

 

 

 

23. The velocities of light in air and glass are 3.0 x 108ms-1 and 2.0 x 108ms-1 respectively. If the angle of refraction is 30°, the sine of the angle of incidence is

 

 

 

 

24. I. A liquid boils when its saturated vapour pressure is equal to the external pressure
II. Dissolved substances in pure water lead to increase in the boiling point.
III. When the external pressure is increased, the boiling point increases.
IV. Dissolved substances in pure water decrease the boiling point.

Which combination of the above are peculiarities of the boiling point of a liquid?

 

 

 

 

25. The equation of a wave travelling along the positive x-direction is given by;
y = 0.25 x 10-3 sin (500t – 0.025x).
Determine the angular frequency of the wave motion.

 

 

 

 

26. Four cells each of e.m.f 1.5V and internal resistance of 4Ω are connected in parallel. What is the effective e.m.f. and internal resistance of the combination?

 

 

 

 

27. Particles of mass 10-2kg is fixed to the tip of a fan blade which rotates with angular velocity of 100rad-1. If the radius of the blade is 0.2m, the centripetal force is

 

 

 

 

28. If the force and the velocity on a system are each reduced simultaneously by half, the power of the system is

 

 

 

 

29. Total internal reflection occurs when light moves from

 

 

 

 

30. Gamma rays are produced when

 

 

 

 

31. The lowest note emitted by a stretched string has a frequency of 40Hz. How many overtones are there between 40hz and 180Hz?

 

 

 

 

32. A semiconductor diode is used in rectifying alternating current into direct current mainly because it

 

 

 

 

33. A boy observes a piece of stone at the bottom of a river 6.0m deep. If he looks from the surface of the river, what is the apparent distance of the stone from him? [Refractive Index of Water = 4/3]

 

 

 

 

34. The velocity ratio of a machine is 5 and its efficiency is 75%. What effort would be needed to lift a load of 150N with the machine?

 

 

 

 

35. A rope is being used to pull a mass of 10kg vertically upward. Determine the tension in the rope if, starting from rest, the mass acquires a velocity of 4ms-1 in 8s [g = 10ms-2]

 

 

 

 

36. A catapult used to hold a stone of mass 500g is extended by 20cm with an applied force F. If the stone leaves with a velocity of 40m/s, the value of F is

 

 

 

 

37. At a fixed point below a liquid surface, the pressure downwards is P1 and pressure upwards is P2. It can be deduced that

 

 

 

 

38. I. The frictional force is independent of the area of the surfaces in conduct II. The frictional force depends on the nature of the surfaces in contact III. The frictional force depends on the speed of sliding IV. The frictional force is directly proportional to the normal reaction.

Which combination of the above is true of sliding friction?

 

 

 

 

39. A ball of mass 0.1kg is thrown vertically upwards with a speed of 10ms-1 from the top of a tower 10m high. Neglecting air resistance, its total energy just before hitting the ground is

(take g = 10ms-2)

 

 

 

 

40. if ∆x is the uncertainty in the measurement of the position of a particle along the x-axis and ∆Px is the uncertainty in the measurement of the linear momentum along the x-axis, then the uncertainty principle relation is given as

 

 

 

 

41. A galvanometer has a resistance of 5Ω. By using a shunt wire of resistance 0.05Ω, the galvanometer could be converted to an ammeter capable of reading 2Amp. What is the current through the galvanometer?

 

 

 

 

42. 2311Na + Proton → pqX + alpha particle
What are the values of p and q respectively in the equation above?

 

 

 

 

43. A solid weigh 10 .00 N in air, 6 N when fully immersed in water and 7 . 0 N when fully immersed in a liquid X. Calculate the relative density of the liquid, X.

 

 

 

 

44. A car of mass 800kg attains a speed of 25m/s in 20 secs. The power developed in the engine is

 

 

 

 

45. In the Rutherford scattering experiment, a beam of alpha particles was fired at a thin gold film with some of the particles being considerably deflected. This shows that

 

 

 

 

46. I. Coherence
II. Same frequency
III. Same wavelength
IV. Same Intensity

Which of the conditions above are necessary to produce interference fringes?

 

 

 

 

47. In fleming’s right-hand rule, the thumb, the forefinger and the middle finger if held mutually at right angles represent respectively, the

 

 

 

 

48. A gas at a volume of V0 in a container at pressure P0 is compressed to one-fifth of its volume. What will be its pressure if the magnitude of its original temperature T is constant?

 

 

 

 

49. A quantity of water at 0°C is heated to about 30°C. At each degree rise in temperature, its density will

 

 

 

 

50. Gamma rays are produced when

 

 

 

 


Question 1 of 50



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