Calculate the inductive reactance of the circuit shown above.
- A. 50.00
- B. 5.00
- C. 0.50
- D. 0.05
- E. 0.02
Calculate the electric potential at a distance of 20.0cm from a point charge of 0.015C placed in air of permittivity (Take 1/4πεo as 9.0 x 109 Nm2C2)
- A. 3.40x106V
- B. 6.75x105V
- C. 6.75x1012V
- D. 3.40x105V
- E. 8.30 x 102V
Calculate the inductance L of the coil in the circuit shown below.
- A. 14.4H
- B. 3.8H
- C. 0.6H
- D. 0.4H
- E. 0.2H
A balloon containing 546cm3 of air is heated from 0oC to 10oC. If the pressure is kept constant, what will be its volume at 10oC?
- A. 526cm3
- B. 546cm3
- C. 556cm
- D. 566cm3
- E. 819cm3
A charge of 1.6 x 10-10C is placed in a uniform electric field of intensity 2.0 x 105NC-1. What is the magnitude of the electric force exerted on the charge?
- A. 3.2 x105N
- B. 1.8 x105N
- C. 3.2 x10-5N
- D. 1.8 x10-5N
- E. 4.0X10-6N
What is the escape velocity of a body on the surface of the earth of radius R if the gravitational constant is G and the mass of the earth is M? (Neglect energy losses to the surroundings)
- A. 2GR
- B. 2G/R
- C. 2GR2
- D. 2GM/R
A listener can detect the instrument from which a note is being sounded because different instruments produce the same note with a different.
- A. frequencies
- B. pitches
- C. loudness
- D. intensities
- E. overtones
An alternating voltage with a frequency of 50Hz has a period of
- A. 0.02s
- B. 0.05s
- C. 0.20s
- D. 0.50 s
- E. 50.00s
The period of a wave is 0.02 second. Calculate its wavelength if its speed is 330 ms-1
- A. 6.6m
- B. 5.0m
- C. 4.0m
- D. 3.3m
- E. 2.0m
A sound note of frequency 250 Hz and wavelength 1.3m is produced at a point near a hill. If the echo of the sound is received 1 second later at the point, how far away is the hill from the point?
- A. 131.3m
- B. 162.5m
- C. 248.7m
- D. 251.3m
- E. 325.0m.
Which of the following wave characteristics can be used to distinguish a transverse wave from a longitudinal wave?
- A. Reflection
- B. Refraction
- C. Diffraction
- D. Polarization
- E. Interference
Which of the following media allow(s) the transmission of sound wave through them? I. Air II. Liquid III. Solid.
- A. I only
- B. II only
- C. III only
- D. I and II only
- E. I, II and III.
Sixty complete waves pass a particular point in 4s. lf the distance between three successive troughs of the waves is 15m, calculate the speed of the waves,
- A. 300.0ms-1
- B. 225.0ms-1
- C. 112.5ms-1
- D. 75.0ms-1
- E. 16.0ms-1
A wire is stretched between two points, 1m apart. If the speed of the wave generated on plucking the wire is 200ms-1, what is the minimum frequency which will resonate with the wire?
- A. 50 Hz
- B. 75 Hz
- C. 100 Hz
- D. 150 Hz
- E. 200 Hz
An object is placed on the principal axis at the centre of curvature of a concave mirror. The image of the object formed by the mirror is
- A. real, inverted and magnified
- B. at the principal focus
- C. real and diminished
- D. erect and virtual
- E. at the centre of curvature
Which of the following is not self-luminous?
- A. Incandescent electric bulb
- B. Incandescent fluorescent tube
- C. Lighted candle
- D. The moon
- E. The sun
The image of any real object formed by a diverging lens is always
- A. inverted
- B. magnified
- C. erect
- D. real
- E. the same size as the object
Light travels in straight lines. In which of the following is this principle manifested? I. Pinhole camera II Formation of shadows III. Diffraction of light IV. Occurrence of eclipse
- A. I and III only
- B. II and III only
- C. I, II and III only
- D. I, II and IV only
- E. I, II, III and IV
A ray of light is incident on a body x as shown in the diagram above. What is the refractive index of the body?
- A. 1.63
- B. 1.50
- C. 1.49
- D. 1.33
- E. 1.02
A ray of light is incident on mirror m1 and after reflection is incident on mirror m2 as shown in the diagram, calculate the angle of reflection of the ray at mirror m2
- A. 120o
- B. 90o
- C. 60o
- D. 45o
- E. 30o
When two objects P and Q are supplied with the same quantity of heat, the temperature change in P is observed to be twice that in Q. lf the masses of P and Q are the same, calculate the ratio of the specific heat capacities of Q to P.
- A. 4 : 1
- B. 2 : 1
- C. 1 : 1
- D. 1 : 2
- E. 1 : 4.