The process of energy production in the sun is?
- A. nuclear fission
- B. nuclear fusion
- C. electron collision
- D. radioactive decay
which of the diagrams above shows the position at which a small ball-bearing is in neutral equilibrium?
- A. A
- B. B
- C. C
- D. D
A progressive wave is represented by \( y = 10 \text{Sin} (1000\pi t – \frac{\pi x}{34}) \) . two layers of the wave separated by 153cm have a phase difference of?
- A. 2700
- B. 450
- C. 900
- D. 1800
- E. No Correct Option
From the diagram above, if the potential difference across the resistor, capacitor and inductor are 80 v, 110 v, 40 v respectively, the effective potential difference is?
- A. 116.3 V
- B. 50.0 V
- C. 230.0 V
- D. 106.3 V
Calculate the e.m.f of the cell in the above circuit if its internal resistance is negligible
- A. 12 V
- B. 8 V
- C. 2 V
- D. 36 V
If a light wave has a wavelength of 500nm in air what is the frequency of the wave?
[c = 3 x 10\(^8\) ms-1]
- A. 3.0 x 1014 Hz
- B. 6.0 x 1014 Hz
- C. 6.0 x 1012 Hz
- D. 2.5 x 1014 Hz
The diagram above represents the graph of the force F applied in stretching a spiral spring against the corresponding extension (X). The force constant of the spring is?
- A. 20 Nm-1
- B. 40 Nm-1
- C. 30 Nm-1
- D. 10 Nm-1
The wave phenomenon demonstrated in the diagram above is?
- A. reflection
- B. deflection
- C. diffraction
- D. refraction
The pressure of two moles of an ideal gas at a temperature of 27oC and volume 10-2m3 is?
[R = 8.313 J mol-1K-1]
- A. 4.99 x 105 Nm-2
- B. 9.80 x 103 Nm-2
- C. 4.98 x 103 Nm-2
- D. 9.80 x 105 Nm-2
The terminal velocity of a ball-bearing falling through a viscous fluid is reached when the?
- A. upthrust is equal to the weight of the ball
- B. ball accelerate uniformly
- C. upthrust is equal to the velocity of the ball
- D. velocity is uniform
A body of mass 12kg traveling at 4.2ms-1 collides with a second body of mass 18kg at rest. Calculate their common velocity if the two bodies coalesce after collision?
- A. 1.5 ms-1
- B. 1.4 ms-1
- C. 2.1 ms-1
- D. 1.7 ms-1
A car accelerate uniformly from rest at 4 ms-2. How far will it travel in the fifth complete second?
- A. 100 m
- B. 50m
- C. 32 m
- D. 18 m
An air craft attempt to fly due north at 100 kmh-1. If the wind blows against it from east to west at 60 kmh-1, its resultant velocity is?
- A. 117 kmh-1, N31oE
- B. 127 kmh-1, N31oE
- C. 117 kmh-1, N31oW
- D. 127 kmh-1, N31oW
The value of x, y and z respectively in the expression M\(^x\) L\(^y\)T \(^z\) for the universal gravitational constant G are?
- A. 2, -3, -2
- B. -1, 3, -2
- C. -1, 2, -3
- D. -2, -1, 3
When a pentavalent impurity is added to a pure semiconductor, it becomes?
- A. a p-type semiconductor
- B. an n-type semiconductor
- C. an insulator
- D. an intrinsic semi-conductor
Which of the following can conduct electricity owing to the presence of free mobile electrons?
- A. germanium
- B. silicon
- C. grapefruit
- D. copper
Thermionic emission is the process whereby?
- A. β - rays are produced
- B. holes are produced
- C. x - rays are produced
- D. electrons leave a hot element
A piece of radioactive material contains 10\(^{20}\) atoms.
If the half life of the material is 20 seconds, the number of disintegration in the first second is?
- A. 3.47 x 1018
- B. 6.93 x 10 20
- C. 3.47 x 1020
- D. 6.93 x 1018
If the decay constant of a radioactive substance is 0.231s-\(^1\), the half-life is?
- A. 3.00 s
- B. 0.12 s
- C. 0.33 s
- D. 1.50 s
Cancerous cells can be destroyed by?
- A. ultraviolet rays
- B. alpha particules
- C. x - rays
- D. infrared rays
A band of 500 rectangular loops of wire of area 20 cm by 20 cm, encloses a region of magnetic field which charges from 1.0T to 0.4T within 5 seconds, calculate the induced e.m.f.
- A. 5.60 v
- B. 24.00 v
- C. 0.24 v
- D. 2.40 v