A lead bullet of mass 0.05 kg is fired with a velocity of 200 m/s into a lead block of mass 0.95 kg. Given that the lead block can move freely, the final kinetic energy after impact is
- A. 100J
- B. 150J
- C. 50J
- D. 200J
The linear expansivity of brass is 2 x 10\(^{-5}\) C\(^{-1}\). If the volume of a piece of brass is 15.00cm at 0°C, what is the volume at 100°C
- A. 16.03cm\(^3\)
- B. 15.09cm\(^3\)
- C. 16.00cm\(^3\)
- D. 15.03cm\(^3\)
One of the features of the fission process is that
- A. it leads to chain reaction
- B. its products are not radioactive
- C. neutrons are not released
- D. the of the masses of the reactants equals the sum of the masses of the products
The pitch of an acoustic device can be increased by
- A. decreasing the loudness
- B. increasing the intensity
- C. increasing the frequency
- D. decreasing the intensity
Which of the following has the lowest internal resistance when new?
- A. Leclanche cell
- B. Daniell cell
- C. Torch battery
- D. Accumulator
In the diagram given if the atmospheric pressure is 760mm, the pressure in the chamber G Is
- A. 660mm
- B. 830mm
- C. 690mm
- D. 860mm
Which of the following may be used to explain a mirage?
I. Layers of air near the road surface have varying refractive indices in hot weather
II. Road surfaces sometimes becomes invisible in hot weather
III. Light from the sky can be refracted upwards after coming close to the road surface.
- A. I and III only
- B. II and III only
- C. II only
- D. I, II and III
In the diagram given the hanging mass m2 is adjusted until m1 is on the verge of sliding. The coefficient of static
- A. \(\frac{m_1}{m_2}\)
- B. \(\frac{m_1g}{m_2}\)
- C. \(\frac{m_2}{m_1}\)
- D. \(\frac{m_2g}{m_1}\)
Which of the following statements are TRUE of isotopes?
I. Isotopes of an element have the same chemical properties because they have the same number of electrons
II. Isotopes of elements are normally separated using physical properties
III. Isotopes of an element have the same number of protons in their nuclei
- A. I and II only
- B. I and III only
- C. II and III only
- D. I, II and III
Which of the following obeys Ohm’s law?
- A. all metals
- B. diode only
- C. all electrolytes
- D. glass
Shadows and eclipses result from the
- A. refraction of light
- B. reflection of light
- C. defraction of light
- D. rectilinear propagation of light
The electrochemical equivalent of silver is 0.0012g/C. If 36.0g of silver is to be deposited by electrolysis on a surface by passing a steady current for 5mins, the current must be?
- A. 6000A
- B. 100A
- C. 10A
- D. 1A
The amount of heat needed to raise the temperature of 10kg of Copper by 1K is its
- A. specific heat capacity
- B. latent heat
- C. heat capacity
- D. internal energy
What type of reaction is represented by the following scheme?
\(_{1} ^{2} X\) + \(_{1} ^{2} Y\) —–> \(_{2} ^{3} Z\) + \(_{0} ^{1} n\) + energy
- A. fusion reaction
- B. fission reaction
- C. Chain reaction
- D. radioactive decay
The diagram shown represents a block-and-tackle pulley system on which an effort of W Newtons supports a load of 120.0N. If the efficiency of the machine is 40, then the value of W is?
- A. 28.0
- B. 48.0N
- C. 233.0N
- D. 50.0N
A narrow beam of white light can be split up into different Colours by a glass prism. The correct explanation is that
- A. white light Is an electromagnetic wave
- B. the prism has all the colours of the white light
- C. different colours of white light travel with different speeds in glass
- D. white light has undergone total Internal reflection in the prism
Cathode rays are
- A. High-energy electromagnetic waves
- B. protons
- C. neutrons
- D. streams of electrons
Which of the following best describes the energy changes which take place when a steam engine drives a generator which lights a lamp?
- A. heat ----> Light----> Sound ----> Kinetic
- B. Kinetic ----> Light ----> Heat ----> Electricity
- C. heat ----> Kinetic ----> Electricity ----> Heat and Light
- D. electricity ----> Kinetic ----> Heat ----> Light
What is the resultant resistance of the circuit in the image shown?
- A. 8Ω
- B. 11Ω
- C. 4Ω
- D. 3.6Ω
Which of the following does NOT describe the Image formed by a plane minor?
- A. Erect
- B. Laterally inverted
- C. Same distance from mirror as object
- D. Magnified
Which of the following is true of an electrical charge?
- A. Positive charge means deficit electrons
- B. Negative charge means excess of electrons
- C. electric current means movement of electrons
- D. All of the above