Calculate the temperature of 6 moles of an ideal gas at a pressure of 7.6 x 106Nm-2 with a volume of 10-3m3.
[R = 8.3jmol-1K-1]
- A. 201oC
- B. 126oC
- C. 153oC
- D. 185oC
Which of the following waves is both transverse and mechanical?
- A. Water waves
- B. Radio waves
- C. Sound waves
- D. X-rays
A radioactive isotope has a decay constant of 10-6s-1.
Calculate its half – life?
- A. 5.93 x 106s
- B. 6.93 x 105s
- C. 6.93 x 109s
- D. 5.93 x 107s
Which of the following electromagnetic waves has the shortest wavelength?
- A. Visible Light
- B. Ultraviolet rays
- C. Infrared rays
- D. Gamma rays
A train with an initial velocity of 20ms-1 is subjected to a uniform deceleration of 2ms-2. The time required to bring the train to a complete halt is
- A. 40s
- B. 10s
- C. 20s
- D. 5s
A projectile is fired from the ground level with a velocity of 300ms-1 at an angle of a 30o to the horizontal.
Calculate the time taken to reach the maximum height?
[g = 10ms-2]
- A. 30s
- B. 20s
- C. 25s
- D. 15s
A metre rule is pivoted at its mid-point with a vertical force of 10N hanging from the distance 30cm from the mid-point. At what distance must a 15N force hang to balance the ruler horizontally?
- A. 30cm
- B. 10cm
- C. 20cm
- D. 25m
What force has to be exerted on a mass 60kg to give it an acceleration of 10ms-2 vertically upwards?
[g = 10ms-2
- A. 300N
- B. 600N
- C. 1200N
- D. 400N
A saturated vapour pressure of a liquid increases when the
- A. Temperature of a liquid increases
- B. Volume of the liquid increases
- C. Volume of the liquid decreases
- D. Temperature of the liquid decreases
A dynamo primarily converts
- A. Mechanical energy into electrical energy
- B. Electrical energy into kinetic energy
- C. Potential energy into kinetic energy
- D. Kinetic energy into potential energy
Which of the following statements is NOT correct?
- A. Brownian motion is an evidence of the particle nature of matter
- B. Atoms combine to form molecules
- C. The molecules of matter are not in constant motion
- D. matter is made up of molecules
Semiconductor is a class of solid whose conductivity increases with an increase in
- A. Pressure
- B. Temperature
- C. Current
- D. Voltage
A boy in a barber’s shop sits between two parallel mirrors. The number of images observed by him will be
- A. Infinite
- B. Ten
- C. Eight
- D. Forty
The heat required to raise a mass of a substance through 1K is known as
- A. Specific heat capacity
- B. Specific latent heat of vaporization
- C. Capacity latent heat of fusion
- D. Heat capacity
The rate of cooling of a heated quantity of liquid in an enclosure depends on the
- A. Pressure of the liquid
- B. Temperature in the enclosure
- C. Pressure of the enclosure
- D. Volume of the liquid
When an athlete perspires after running, he loses heat through
- A. Evaporation
- B. Conduction
- C. Radiation
- D. Convection
A wire of length 10m is cooled from 50oC to 10oC. Calculate the decrease in the length of the wire. [c = 3 x 10-5K-1]
- A. 1.8 x 10-4m
- B. 1.5 x 10-4m
- C. 1.2 x 10-2m
- D. 1.8 x 10-3m
What is the angular magnification of a telescope having objective and eyepiece lenses of a focal lengths 30cm and 3cm respectively?
- A. 60
- B. 10
- C. 30
- D. 90
The instrument used to view stars is the
- A. Prism binoculars
- B. Telescope
- C. Film projector
- D. Microscope
Which of the following statements is correct about a machine?
- A. Efficiency of a machine is always greater than I
- B. Efficiency decreases with an increase in friction
- C. Velocity ratio depends on friction
- D. Mechanical advantage increases with an increase in friction
An object is placed 15cm in front of a plane mirror. If the mirror is moved further 5cm away from the object and the image is
- A. 80cm
- B. 40cm
- C. 50cm
- D. 70cm