If the frequency of the ac. circuit illustrated above is 500/π Hz what would be the reactance in the circuit?
(Inductance (L) = 0.9H, Capacitance (C) = \(2 \times 10^{-6}\)
- A. 0.0009Ω/π
- B. 100Ω
- C. 1030Ω
- D. 400Ω
- E. 2500Ω
A charge of 1.0 x 10-5 Coulombs experience force of 40N at a certain point in space. What is the electric field intensity?
- A. 8.00 x 106NC-1
- B. 4.00 x 106NC-1
- C. 4.00 x 10-4NC-1
- D. 2.00 x 10-4NC-1
- E. 2.50 x 10-1NC-1
What is the value of R when G shows no deflection in the circuit illustrated above?
- A. 80Ω
- B. 75Ω
- C. 45Ω
- D. 20Ω
- E. 10Ω
A work of 30 joules is done is transferring 5 millicoulombs of charge from a point B to a point A in an electric Held. The potential difference between B and A is
- A. 1.7 x 10-4V
- B. 3.4x10-4V
- C. 1.5x10-1V
- D. 6.0 x103V
- E. 1.2 x104V
What is the electric potential energy between two protons each of charge q and at a distance of r apart? (Permittivity of free space = εo)
- A. 4πεoq2r
- B. qr/4πεo
- C. q/4πεor
- D. q2/4πεor
- E. q2/4πεo
Calculate the current in the 3Ω resistor shown in
the diagram above.
- A. 3.0A
- B. 4.0A
- C. 4.3A
- D. 12.0A
- E. 39.0A
Given that the gravitational constant is 7 X 10-11 Nm2kg-2, what is the force of attraction between 106kg mass of lead hanging one metre away from a 103kg mass of iron?
- A. 7 x10-20N
- B. 7 x 10-5N
- C. 7x10-2N
- D. 7x103N
- E. 7x100N
Which of the following pairs of light rays shows the widest separation in the spectrum of white light?
- A. Yellow and red
- B. Orange and green
- C. Violet and blue
- D. Blue and green
- E. Red and indigo
A simple microscope forms an image twice the size of the object. If the focal length of the lens of the microscope is 20m, how far is the object from the lens?
- A. 10m
- B. 20m
- C. 30m
- D. 40m
- E. 60m
The eye defect illustrated by the diagram above is
- A. astigmatism
- B. long sightedness
- C. loss accommodation
- D. short sightedness
- E. colour blindness
The eye defect illustrated by the diagram above is
- A. astigmatism
- B. long sightedness
- C. loss accommodation
- D. short sightedness
- E. colour blindness
The diagram above shows an incident ray A, inclined at angle of 50º to the interface CB. The ray OB is found to lie along the surface. What is the refractive index of the medium X with respect to air?
- A. sin50o/sin40o
- B. sin40osin50o
- C. sin90o/sin50o
- D. sin40o/sin90o
- E. sin90o/sin40o
The diagram above shows an incident ray A, inclined at angle of 50o to the interface CB. The ray OB is found to lie along the surface. What is the refractive index of the medium X with respect to air?
- A. sin50o/sin40o
- B. sin40osin50o
- C. sin90o/sin50o
- D. sin40o/sin90o
- E. sin90o/sin40o
A parallel beam of light is to be obtained from the headlamp ofa car. At which of the following positions should the source of light be placed from the pole of its spherical minor?
- A. At the focal point
- B. At the centre of curvature
- C. Beyond the centre of curvature
- D. Between the focal point and the pole
- E. Between the focal point and the center of curvature
Where will the image of the object OB shown in the diagram above be located after reflection from the mirror?
- A. At F
- B. Beyond C
- C. Between O and P
- D. Between P and F
- E. Between F and C
A concave mirror of radius of curvature 20cm has a pin placed at 15cm from its pole. What will be the magnification of the image formed?
- A. 4.00
- B. 2.00
- C. 1.33
- D. 1.50
- E. 0.25
A stone is dropped into the middle of a pool of water. Which of the following statements is/are correct? I, Spherical waves are set up in the water. II. The water moves outwards to the sides of the pool. III. Energy is transmitted outwards from the centre of disturbance
- A. I only
- B. II only
- C. III only
- D. I and III only
- E. II and III only.
Which of the following is/are necessary for the production of interference with two wave trains? I. The sources must be close to each other. II The waves must have the same frequency. III. The waves must have the same amplitude. IV. The waves must travel with the speed of light.
- A. I, II and IV only
- B. I, II and III only
- C. I and II only
- D. II, III and IV only
- E. l, III and IV only
The diagram above represents part of a wave motion in air. If the wave travels with a speed of 300ms-1calculate the frequency of the wave.
- A. 360Hz
- B. 300Hz
- C. 250Hz
- D. 150Hz
- E. 100Hz
Which of the following is/are characteristics of sound? I Pitch II. Loudness III. Quality IV Noise
- A. I only
- B. II only
- C. I and II only
- D. l, II and III only
- E. I, II, III and IV
A tuning fork sounds louder when its stem is pressed against a table top than when held in air because
- A. a larger mass of air is set vibrating by the table top
- B. the whole table vibrates in resonance
- C. the whole table has acquired a larger frequency
- D. the fork and table have the same frequency
- E. the amplitude of the vibrating fork is increased.