A glass bottle of initial volume 2 x 104 cm3 is heated from 20oC to 50oC. If the linear expansivity of glass is 9 x 10-6K-1, the volume of the bottle at 50oC is
- A. 20016.2cm3
- B. 20005.4cm3
- C. 20008.1cm3
- D. 20013.5cm3
What type of reaction is represented by the equation \(^{2}_{1}X+^{2}_{1}X\rightarrow^{3}_{2}Y+^{1}_{0}n+Energy\)
- A. Ionization
- B. Fusion
- C. Fission
- D. Chain
When \(^{210}_{82}Pb\) decays to \(^{206}_{80}Pb\), it emits
- A. two alpha and two beta particles
- B. an alpha particle
- C. one beta particle
- D. one alpha and one beta particle
Which of the following is NOT a Fundamental S.I unit?
- A. Metre
- B. Ampere
- C. Newton
- D. Second
Which gas produces a red coloured light in a discharge tube?
- A. Mercury
- B. Argon
- C. Air
- D. Neon
Calculate the mass of the copper deposited during electrolysis when a current of 4A passes through a copper salt for 2 hours. [Ece of Copper z=3.3×10-7kgC-1]
- A. 2.9x105kg
- B. 9.5x10-7kg
- C. 9.5x10-3kg
- D. 2.9x104kg
When an atom undergoes a beta decay, the atomic number of the nucleus
- A. Remains unchanged
- B. Decreases by one
- C. Increases by one
- D. Becomes zero
The magnitude of the angle of dip at the equator is
- A. 360o
- B. 0o
- C. 90o
- D. 180o
What is the best method of demagnetizing a steel bar magnet?
- A. Hammering
- B. Heating it
- C. Rough handling it
- D. Solenoid method
A circuit has a resistance of 200Ω. The resistance of the circuit can be reduced to 120Ω when
- A. A 300Ω resistor is connected to it in parallel
- B. An 80Ω resistor is conneceted to it in series
- C. A 150Ω resistor is connected to it in parallel
- D. A 240Ω resistor is connected to it in series
The maximum power transfer occur in a cell when the external resistance is
- A. Twice the internal resistance of the cell
- B. The same as the internal resistance of the cell
- C. Greater than the internal resistance of the cell
- D. Less than the internal resistance of the cell
What charge is stored in a 0.1F capacitor when a 10V supply is connected across it?
- A. 1C
- B. 5C
- C. 4C
- D. 2C
When a negatively charged rod is brought near the cap of a charged gold leaf electroscope which has positive charges, the leaf
- A. Remains the same
- B. Collapses
- C. Collapses and diverges again
- D. Diverges
When a telescope is in normal use, the final image is at
- A. Infinity
- B. The focus
- C. The radius of curvature
- D. The near point
In a compound microscope, the objective and the eye piece focal lengths are
- A. At infinity
- B. Long
- C. Short
- D. The same
The focal length of a concave mirror is 2.0cm. If an object is placed 8.0cm from it, the image is at
- A. 2.7m
- B. 2.0m
- C. 2.3m
- D. 2.5m
An object is placed 10m from a pinhole camera of length 25cm. Calculate the linear magnification.
- A. 2.5x102
- B. 2.5x10-2
- C. 2.5x10-1
- D. 2.5x101
A boy receives the echo of his clap reflected by a nearby hill 0.8s later. How far is he from the hill? [ speed of sound in air = \(340ms^{-1}\)
- A. 528m
- B. 66m
- C. 136m
- D. 264m
The distance between two successive crests of a wave is 15cm and the velocity 300ms-1. Calculate the frequency.
- A. 2.0x102Hz
- B. 4.5x103Hz
- C. 2.0x103Hz
- D. 4.5x102Hz
Heat transfer by convection in a liquid is due to the
- A. Latent heat of vaporization of the liquid
- B. Increased vibration of the molecules of the liquid about theit mean position
- C. Variation of density of the liquid
- D. Expansion of the liquid as it is heated