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1. The area under force-time graph presents

A. change in kinetic energy
B.change in momentum
C. work done
D. change in internal energy

2. From the principle of flotation , a body sinks in s fluid until it displaceas a quantity of fluid equal to its own

A. density
B. mass
C.weight
D. volume

3. The length of a simple pendulum is increased by a factor of four. By what factor is its period increase?

A. $0.5\pi$
B. $2$
C. $2\pi$
D. $4$

Q4 See pages for figures

5. The linear expansivity, $\alpha$, and cubic expansivity, $\gamma$, of a material are related by the equation

A. $\gamma=\alpha$
B. $\gamma=3 a$
C. $\gamma=2 a$
D. $\gamma=\frac{1}{3} a$

Q6 See pages for figures

7. The correct relationship between the displacement, $s$ of a particle initially at rest in a linear motion and the time , $t$ is

A. $s \alpha t^{-2}$
B. $s \alpha t^{-1}$
C. $s \alpha t$
D. $s \alpha t^2$

8. The Joule is equivalent to

A. $kg m^2$
B. $kg^2 m s^{-2}$
C. $kg m^2 s^{-2}$
D. $kg m s^{-1}$

9. Which of the follwing statement(s) is/ are correct about a fixed mass of gas compressed in an incompressible container?

I. The average speed of molecules increases.

II. The temperature of the gas increases.

III. The molecules hit the walls of the container more often than before the compression.

A. I only
B. I and II only
C. I and III only
D. I, II and III.

10. An example of a mechanical wave is

A. water wave
B. radio wave
C. x-rays.
D. ligth rays.

11. Which of the follwing discriptions of the image formed a plane mirror is NOT correct? The image is

A. errect and of the same size as the object.
B. laterally inverted and of the same size as the object.
C. errect and bigger than the object.
D. virtual and of the same size as the object.

12. The efficiency of a wheel and axle is $100\%$ and the ratio of their radii is $5:1$. Calculate the effort required to lift a load of mass $20kg$ using this machine.[$g=10 ms^{-2}$]

A. 20 N
B. 25 N
C. 40 N
D. 100 N

13. A freely suspended compass needle on the earth’s surface settles in a palne called.

A. Geographic meridian
B. magnetic meridian
C. magnetic declination
D. isoganals

14. An object is palced at different distances. $u$, from a converging length, $15.0cm$. For what value of $u$ does the lens act as a simple microscope?

A. $u=15 cm $ only
B. $u=30 cm $ only
C. $u < 15 cm $ only
D. $u>30cm $ only

15. The periodic rise and fall in the intensity of sound produced when two notes of nearly equal frequencies are sounded together is called.

A. dopller effect
B. beat
C. interference
D. resonance

16. The power of a lens is $+25 D$. What is its radius of curvature ?

A. 2.5cm
B. 25.0cm
C. 40.0cm
D. 80.0cm

17. The breason for having a large number of turns in the coil of a moving coil galvanometer is to

A. make the deflection of the needle proportional to the current
B. increase the sensitivity of the galvanometer
C. decrease the magneticflux, produced by the magnet
D. make the permanent magnet stronger.

18. Current is pased through two parallel conductors in the same direction. If the conductors are placed in near each other , they will.

A. move in a circle
B. repel each other
C. remain stationary
D. attract each other

19. The period of a $10Hz$ radio wave travelling at $3.0\times 10^8 ms^{-1}$ is

A. $3.0\times 10^{-5} s$
B. $1.0\times 10^{-4} s$
C. $1.0\times 10^{4} s$
D. $3.0\times 10^{4} s$

$T=10\times 10^{3}Hz \therefore T=\frac{1}{10\times 10^3}=1.0\times 10^{-4}s$

20. The magnetic material produced from the chemical combinatio of metal oxides and has a very high resistance to electric current is called

A. ferrite substance
B. paramagnetic substance
C. ferromagnetic substance
D. diamagnetic substance

21.A body of mass M, moving with a velocity, V, has a wavelength, $\gamma$, associated with it. The phenomenon is called.

A. photoelectric effect
B. Heisenberg’s uncertainty principle
C. Compton effect
D. wave particle paradox.

22. Which of the follwoing statements about a straigth current-carrying wire placed in a uniform magnetic field is correct? The wire experiences

A. maximum motor force if the current reverses its direction
B. no motor if it is parallel to the field
C. no motor force if it is perpendicular to the field.
D. a motor force with constant direction if either the current or the magnetic field is reversed.

23. THREE cells each of $emf$, $1.1 V$ and internal resistance, $2\Omega$ are connected in parallel across a $3\Omega$ resistor. Determine the current in the resistor.

A. 0.90 A
B. 0.39 A
C. 0.30 A
D. 0.01 A

24. Which of the following staements about electric potential energy is not correct?
A. The electric potential energy of a positively charged particle increases when it moves to a point of higher potential.
B. The electric potential energy of a negatively charged particle increases when it moves to a point of lower potential.
C. The electric potential energy of a positively charged particle decreases when it moves to a point of higher potential.
D. The work done in taking a chargeed particle around a closed path in a electric field is zero.

25. A galvanometer with a full scale deflection of $20m A$ is converted to read $8V$. By connecting a $395\Omega$ resistor in series with it. Determine the internal resistance of the galvanometer.

A. $2.5\Omega$
B. $5.0 \Omega$
C.$8.0 \Omega$
$10.0 \Omega$

26. An inductor of inductance $10H$ is connected across an a.c circuit source of $50 V$, $100Hz$. What is the current of the circuit?[$\pi =3.14$]

A. 0.200 A
B. 0.070 A
C. 0.0500 A
D. 0.008 A

27. The speed of fast-moving neutrons in a nuclear reactor can be reduced by using

A. graphite rods
B. concrete shield
C. iron rods
D. boron rods

28. In a series $R-L-C$ circuit at resonance, impedance is

A. maximum
B. minimum
C. capacitive
D. inductive

29. A lamp is rated $240 V$, $60 W$. Determine he resistance of the lamp when lit.

A. $120 \Omega$
B. $240 \Omega$
C. $540 \Omega$
D. $960 \Omega$

30. One major reason why electrical appliances in homes are normally earthed is that the

A. person touching the appliances is safe from electric shock.
B. appliances are maintained at a higher $p.d$ than the earth
C. appliances are maintained at a lower $p.d$ than the earth
D. appliances are maintained at the same $p.d$ than the earth

31. In doping an electric semi conductors to produce a $p-$type semiconductor,

A. the semiconductor is heated up.
B. a donor element is added
C. an acceptor element is added
D. the semiconductor is connected to the battery.

32. Arrange the following radiation in order of increasing ionization of air.

I. Alpha II. Gamma III. Beta

A. I< II < III
B. II< I < III
C. II < III < I
D. I < II < III

33. If the kinetic energy of an electron is $100 eV$, what is the wavelength of the de-Broglie wave associated with it? [$6.6 \times 10 ^{34} Js$, $e=1.6\times 10^{-19} C $,$ m_e= 9.1 \times 10^{-31}kg$]

A. $1.22\times 10 ^{-10}m$
B. $4.10\times 10 ^{-10}m$
C. $3.90\times 10 ^{-10}m$
D. $5.50\times 10 ^{-10}m$

34. Gamma rays are produced when

A. high velocity electron are abruptly stopped in metals
B. energy changes occur within the nuclei of atoms
C. energy changes occur within the electronic structure of the atoms
D. electrons are deflected in very strong magnetic fields.

35. The half-life of a radioactive substance is $15$ hours, if at some instances , the sample has a mass of $512g$, calculate the time it will take $\frac{7}{8}$ of the sample to decay.

A. 15 hours
B. 30 hours
C. 45 hours
D. 50 hours

36. When the direction of vibration of the particles of a medium is perpendicular to the direction of of propagation of a wave, the wave is said to be.

A. longitudinal
B. transverse
C. mechanical
D. a sound wave

37.A hunter fired a gun at a point $408m$ away from a cliff. If the hear can echo 2.4s later, determine the speed of the sound wave.

A. $340ms^{-1}$
B. $380ms^{-1}$
C. $400ms^{-1}$
D. $680ms^{-1}$

38. The distance between the fixed points of a mercury-in-glass thermometer is $30cm$. Determine the temperature when the mercury level is $10.5cm$ above the lower fixed point.

A. $28.6^{0}C$
B. $30.0^{0}C$
C. $35.0^{0}C$
D. $40.5^{0}C$

39. Which of the following statements about electromagnetic wave is not correct?

A. They carry energy as they travel through the space
B. They travel with the speed of light
C. They are longitudinal
D. The electric and magnetic fields are at right angle to each other.

40. The diameter of a brass ring at $30^0 C$ is $50.0cm$. To what temperature must the ring be heated to increase its diameter to $50.29cm$? [linear expansivity of brass=$1.9\times 10^{-5}K^{-1}$].

A $152.6^{0}C$
B.$182.6^{0}C$
C.$306.1^{0}C$
D.$335.3^{0}C$

41. Which of the following concepts is a method of heat transfer that does not require a material medium?

A. Conduction
B. Diffusion
C. Convection
D. Radiation

42. Which of the following statements about light travelling from one material medium to another is not correct?

A. The refracted angle is less than the incident angle, if the speed is higher in the first material
B. It bends away from the normal, if the speed is lower in the first material
C. Its wavelength does not change
D. Its frequency changes.

43. The engine of a car provides a forward forceof $1240N$ and the total resistive force is $1240$.

If the mass of the car is $1220kg$, determine the distance the car has to travel from the rest before acquiring a speed of $4ms^{-1}$

A. 44.0m
B. 22.2m
C. 11.1m
D. 5.5m

44. A quantity of water at $0^{0}C$ is heated to $30^{0}C$. For each degree rise in temoerature , its density will

A. rise steadily
B. fall steadily
C. fall and then rises
D. rise and then fall

45. A small object has a mess $50g$ is released from a point $A$. Determine the velocity of the object when it reaches a point $B$, a vertical distance of $30m$ below $A$. [ $g=10ms^{-2}$].

A. $1.5ms^{-1}$
B. $6.0ms^{-1}$
C. $17.3ms^{-1}$
D. $24.5ms^{-1}$

46. Molecules moves in random motion within a liquid . The toatal internal energy of the liquid depends on all of the follwing except Its

A. temperature
B. mass
C. specific heat capacity
D. melting point

47. the viscosity of a fluid depends on the following factor except the

A. relative motion between the layer of the fluid
B. nature of the material of the fluid
C. surface area of the fluid in contact
D. normal reaction of the fluid.

48. Using Vernier callipers, which of the following readings gives the correct measurement for the length of a rod.

A. 4.1cm
B. 4.13cm
C. 4.125cm
D. 4.1254cm

49. The basic principle of operation of a beam balance is

A. Archimedes principle
B. law of flotation
C. Hooke’s law
D. principle of motion

50. In which of the following situations is friction not useful?

A. Operation of a grinding machine
B. Walking
C. Application of brakes
D. Moving priston in a sleeve.