Two capacitors C1 and C2 are connected as shown in the diagram. The capacitance C2 is twice C1 when the key is opened the energy stored up in C1 is W. If the key is later closed and the system is allowed to attain electrical equilibrium, the total energy stored in the system will be
- A. \(\frac{1}{2}\)W
- B. \(\frac{2}{3}\)W
- C. W
- D. 2w
- E. 3W
Two objects of masses 80kg and 50kg are separated by a distance of 0.2m. If the gravitational constant is 6.6 x 10-11Nm
- A. 4.9 x 10-9N
- B. 1.3 x 10-6N
- C. 6.6 x 10-8N
- D. 6.6 x 10-6N
- E. 2.6 x 10-9N
If the frequency of the e.m.f. source in the a.c. circuit illustrated above is \(\frac{500}{\pi}\)Hz. What is the reactance of the inductor?
- A. 450
- B. 0.9
- C. 900
- D. 567
- E. 43
A particle of charge q and mass m moving with a velocity v enters a uniform magnetic field b in the direction of the field. The force on the particle is
- A. qvB
- B. mqvB/m
- C. mvB/q
- D. O
In which of the following is a stationary wave produced? i. A vibrating turning fork held near the end of a resonance tube closed at one end. ii. A string tightly stretched between two points and plucked at its middle. iii. The tuning fork vibrating in air
- A. i only
- B. ii only
- C. i and ii only
- D. ii and iii only
- E. i, ii and iii
A man standing 300m away from the wall sounds a whistle. The echo from the wall reaches him 1.8sec. later, calculate the velocity of sound in air
- A. 540.0ms-1
- B. 333.3ms-1
- C. 270.0ms-1
- D. 166.7ms-1
- E. 83.3ms-1
Which of the following statements is true of the diagram shown above?
- A. the two point, A and B are in phase
- B. distance AB is halgf the wavelength of the wave
- C. AC and BD are the amplitude of the wave
- D. the two points A and B represents the wave crests
- E. the wave has four crests
The sound from a bell in an enclosed jar gradually faints away while the jar is being evacuated. Which of the following explains this observation?
- A. the pressue is reduced
- B. the sound waves are pumped out
- C. the waves are absorbed in the inner walls
- D. There is no more material medium
- E. the air is disturbed
What type of motion does the skin of a talking drum perform when its being struck with the drum stick?
- A. random
- B. rational
- C. vibratory
- D. translational
- E. circular
Which of the following statements about wave is not correct? i. A wavefront is a line which contains all particles whose vibration are in phase. ii. The direction of propagation of a wave is the link drawn parallel to the wavefront. iii. A wavefront is a circle which is common to particles that are in the same state of disturbance
- A. i only
- B. ii only
- C. i and ii only
- D. i and iii only
- E. ii and iii only
Which of the following remains unchanged as light travels from one medium to the other? i. speed. ii. wavelength. iii. frequency.
- A. i only
- B. ii only
- C. iii only
- D. i and ii only
- E. i and iii only
Which of the following is not a mechanical wave?
- A. wave propagatd in stretched string
- B. wave in closed pipe
- C. radio waves
- D. water waves
- E. sound waves
what part of the camera corresponds to the iris of the eye?
- A. shutter
- B. film
- C. lens
- D. diaphram
- E. focusing ring
At which of the following distances from the lens should a slide be placed on a slide projector if f is the focal length of the projector length?
- A. less than f
- B. greater than f but less than 3f
- C. equal to f
- D. equal to 2f
- E. greater than 2f
Which of the following are true of plane-polarised right? i. Plane polarisation of light is the formation of hydrogen bubbles on the particle of light. ii. Plane components. iii. A plane polarised light vibrates in one plane. iv. Polarisation of light is characteristic of transverse vibration
- A. i and ii only
- B. i and iv only
- C. ii and iii only
- D. i and ii only
An image which can be formed on a screen is said to be
- A. virtual
- B. blurred
- C. inverted
- D. erect
- E. real
Calculate the refractive index of the material of the glass block shown in the diagram if YZ = 4cm
- A. 0.40
- B. 0.60
- C. 1.50
- D. 1.67
- E. 2.50
A ray of light is incident at an angle of 30o on a glass prism of refractive index 1.5. Calculate the angle through which the ray is minimally deviated in the prism. (The medium surrounding the prism is air)
- A. 10.5o
- B. 19.5o
- C. 21.1o
- D. 38.9o
- E. 40.5o
In the arrangement illustrated above, Y and B are yellow and blue transparent light filters respectively through the filters is
- A. blue
- B. red
- C. yellow
- D. green
- E. black
Two mirrors are inclined as shown in the diagram. A ray of light RO strikes the arrangement at O and emerges along PO. The emergent ray has been deviated through
- A. 240o
- B. 180o
- C. 120o
- D. 60o
- E. 30o
The graph above shows the expansion of water as the temperature increases from 0oC. Which of the following deductions from the graph are true? i. Water has its maximum density at Q. ii. The volume of water is greater at 0oC than at 4oC. iii. The volume of water decreases uniformly when cooled from 100oC. iv. When water solidifies, its volume increases
- A. i and ii only
- B. i and iii only
- C. ii and iii only
- D. i, ii and iii only
- E. i, ii and iv only