1. Which of the following is not true about semi conductors? A. Moving holes are equivalent to moving positive charges B. There are two

kinds of charge carriers, a free electron and a hole C. The escape of a valence electron from atom produces electron-hole pair of charge carriers D. Increase in temperature increases electrical resistance

**Right choice – Option D **

2. A wire carrying a current of 10A and 2.5m in length is placed in a field of flux intensity 0.14T. What is the force in the wire if it

is placed at 60^{o} to the field? A. 30.3N B. 8.25N C. 153N D. 10.5N

**Right choice – Option A **

3. In the transformer, the magnetization of the core is repeatedly reversed by the alternating magnetic field resulting in energy

dissipation as heat. This loss is called A. Eddy currents loss B. Hysteresis loss C, Flux leakage loss D. Joule heat loss

**Right choice – Option B **

4. A step-up transformer is designed to operate from a 25V supply. If the transformer is 80 percent efficient, determine the current in the primary coil when the output terminals are connected to 240V. 100w lamp A. 5.0A B. 4.0A C.2.5A D. 2.0A

**Right choice – Option A**

5. Which of the following pairs consist of fundamental quantities only? A. Velocity and gravitational potential B. Acceleration and

field strength C. Momentum and work done D. Moment and force

**Right choice – Option None **

6. One of the limitations of Thompson’s model of the atom is that it does not explain, A). small angle scattering B). stability of the

atom C). ionization progress D). the variation of the effective atomic radius

**Right choice – Option A **

7. An atom is said to be excited if an electron of the atom is A. in the round state B. At infinity C. promoted to an energy level

higher than its original Level D. having an energy level of 0.0eV

**Right choice – Option C**

8. The minimum energy necessary to remove an electron from a given atom to infinity is called A. Excitation energy B. Ground state

energy C. lonization energy D. Binding energy

**Right choice – Option C **

9. Find the de Broglie wavelength of a 0.01 Kg pellets having a velocity of 10m/s [h = 6.63 x 10^{34} Js) A.6.63 x 10^{31}m B. 6.63 x 10^{32}m C. 6.63 x 10^{-33}m D. 6.63 x 10^{30}m

**Right choice – Option C **

10. What happens to the proton number Z and, the nucleon number A of a nuclide which emits a y – radiation’? A. Z increases by 1 while A does not change B. Z increases by 1 and A increases by 1 C. Z and A neither increase or decrease D. Z increases by 1 while A

decreases by 1

**Right choice – Option C **

11. A note that is an OCTAVE higher than a given note of frequency 256HZ would have a frequency of A. 2048Hz B .1024Hz C .128Hz D. 512Hz

**Right choice – Option D **

12. The QUALITY and PITCH of a musical note depends respectively on A. Frequency and harmonics B. Overtones and intensity C. Intensity and frequency D. Overtones and frequency

**Right choice – Option D **

13. A sound wave of frequency 130Hz and wavelength 2.0m was produced at a distance (d) from a target and echo was heard at the source

0.5 second later, calculate the value of d. A. 65.0 m B. 130 m C. 260 m D.520 m

**Right choice – Option A **

14. In an experiment, lead shot contained in a vertical cardboard cylinder falls through 100cm when the cylinder is inverted. Calculate

the rise in temperature caused by 100 such inversions. [specific heat capacity of lead = l30Jkg-1K-1, g = 10ms-2 A. 3.3K B. 4.4K

C. 5.5K D.7.7K

**Right choice – Option **

15. A body is projected with a velocity Vms-1, inclined at an angle B to the vertical. Which of the following gives the CORRECT expression for the horizontal component of velocity Vx after time t? A. VcosB B. VsinB C. VgcosB D. VtsinB

**Right choice – Option B **

16. An object of mass 0.2 Kg and density 600Kgm^{-3} is suspended with a string so that 1/10 of it is immersed in paraffin of density 900Kgm-3. Find the tension in the string. A. 0.2N B. 2.0N C. 1.0N D. 0.1N

**Right choice – Option **

17. A rocket burns fuel at the rate of 20Kgs-1 and ejects it with a velocity of 5.0 x 10^{3}ms-1 Calculate the thrust exerted by the gas on the rocket A. 1.0 x 10^{5}N B. 2.0 x 1o^{5} N C. 3.0 x 10^{5}N D. 5.0 x 10^{5} N

**Right choice – Option A **

18. A converging lens has radius of curvature calculate the power of the lens A. 0.0625 8.0.125 C. 0.250 D. 0.500

**Right choice – Option B **

19. If the velocity of light in air is 3.0 x 10^{8}ms-1 find the velocity of light in a medium whose refractive index is 1.5 A. 5.0 x 10^{8} ms-1 B. 5.0 x 10^{7}ms-1 C. 2.5 x 10^{8}ms-1 D. 2.5 x 10^{7}ms-1

**Right choice – Option **

20. When an object is at infinity to the pole of a concave mirror the image formed is at A. Principal focus, real and diminished B.

Center of curvature, real and inverted C. Center of curvature, virtual and erect D. Principal focus, real and erect

**Right choice – Option A**