In a fission process, the decrease in mass is 0.01%. How much energy could be obtained from the fission of 0.1g of the material
- A. \( 9.0 \times 10^{9}J \)
- B. \( 9.0 \times 10^{10}J \)
- C. \( 6.3 \times 10^{11}J \)
- D. \( 9.0 \times 10^{11}J \)
If the uncertainty in the measurement of the position of a particle is 5.0 x 10-10m, the uncertainty in the momentum of the particle is
- A. 1.32 x 10-44Ns
- B. 3.30 x 10-44Ns
- C. 1.32 x 10-24Ns
- D. 3.30 x 10-24Ns
Given that young’s modulus for aluminium is 7.0 x 1010Nm-2 and density is 2.7 x 103kgm-3 find the speed of the sound produced if a solid bar is struck at one end with a hammer
- A. 5.1 x 103ms-1
- B. 4.2 x 103ms-1
- C. 3.6 x 103ms-1
- D. 2.8 x 103ms-1
A force of 100N was used to kick a football of mass 0.8kg. Find the velocity with which the ball moves if it takes 0.8s to be kicked
- A. \(32ms^{-1} \)
- B. \(50ms^{-1} \)
- C. \(64ms^{-1} \)
- D. \(100ms^{-1} \)
An electron makes a transition from a certain energy level Ek to the ground state E0. If the frequency of emission is 8.0 x 1014Hz The energy emitted is
- A. 8.25 x 10-19J
- B. 5.28 x 10-19J
- C. 5.28 x 1019J
- D. 8.25 x 1019J
In the calibration of an ammeter using faraday’s laws of electrolysis, the ammeter reading is kept constant at 1.2A. If 0.990g of copper is deposited in 40 minutes , the correction to be applied to the ammeter is
- A. 0.03A
- B. 0.04A
- C. 0.05A
- D. 0.06A
A ray of light is incident on an equilateral triangular glass prism of refractive index 3/2, Calculate the angle through which the ray is minimally deviated in the prism
- A. 30.0\(^{\circ} \)
- B. 37.2\(^{\circ} \)
- C. 42.0\(^{\circ} \)
- D. 48.6\(^{\circ} \)
A bead traveling on a straight wire is brought to rest at 0.2m by friction. If the mass of the bead is 0.01kg and the coefficient of friction between the bead and the wire is 0.1 determine the work done by the friction
- A. \( 2 \times 10^{-4}J \)
- B. \( 2 \times 10^{-3}J \)
- C. \( 2 \times 10^{1}J \)
- D. \( 2 \times 10^{2}J \)
When a nucleus is formed by bringing protons and neutrons together, the actual mass of the formed nucleus is less than the sum of the masses of the energy equivalent of this mass difference is the
- A. lost energy
- B. work function
- C. binding energy
- D. stability energy
The major difference between a pure semiconductor and a pure metal is that
- A. metals are harder than semiconductor
- B. while resistance of metals decrease with temperature , the reverse is the case for semiconductor
- C. the resistance of metals increases with temperature, while for semiconductors, it is the reverse
- D. metals have forbidden gaps while semiconductors have not
In a semi conductor junction diode, as the depletion or barrier layer is forward-biased, the layer
- A. widens
- B. narrows
- C. remains constant
- D. widens then narrows
When an alternating current given by I = 10sin (120π)t passes through a 12Ω resistor, the power dissipated in the resistor is
- A. 1200W
- B. 600W
- C. 120W
- D. 30W
The maximum kinetic energy of the photoelectron emitted from a metal surface is 0.34eV. If the work function of the metal surface is 1.83eV,find the stopping potential.
- A. 2.17V
- B. 1.49V
- C. 1.09V
- D. 0.34V
The force on a charge moving with velocity v in a magnetic field B is half of the maximum force when the angle between v and B is
- A. 90o
- B. 45o
- C. 30o
- D. 0o
A circuit has an area of 0.4m2 and consists of 50 loops of wire. If the loops are twisted and allowed to rotate at a constant angular velocity of 10 rad s-1 in a uniform magnetic field of 0.4T, the amplitude of the induced voltage is
- A. 8V
- B. 16V
- C. 20V
- D. 80V
The count rate of a radioactive material is 800 count/min. If the half-life of the material is 4 days, what would the count rate be in 16 days later
- A. 200 count / min
- B. 100 count / min
- C. 50 count / min
- D. 25 count / min
A ray incident on a glass prism undergoes minimum deviation when the
- A. incident angle is equal to the angle of refraction
- B. refraction angle equals 90o
- C. incident angle equals 90o
- D. incident angle is equal to the angle of emergence
The most suitable cell used for short interval switches in electric bells is a
- A. lead- acid accumulator
- B. Daniel cell
- C. Leclanche cell
- D. nickel iron accumulator
Which of the following pairs of light rays show the widest separation in the spectrum of white light
- A. Blue and red
- B. Green and yellow
- C. Indigo and violet
- D. Orange and red
I It retains its magnetic much longer than steel.
II It is more easily magnetized than steel
III It is more easily demagnetized than steel
IV It produces a stronger magnet than steel
Which combination of the above makes iron preferable to steel in the making of electromagnets?
- A. I and II only
- B. II and III only
- C. I, III, and IV only
- D. II, III and IV only
A magnetic field is said to exist at a point if a force is
- A. exerted on a stationary charge at the point
- B. exerted on a moving charge at the point
- C. deflected at the point
- D. strengthened at the point