The refractive index of a given transparent medium is 1.4. Which of the following is the minimum internal angle for total internal reflection to take place in the medium?
- A. 30o
- B. 36o
- C. 44o
- D. 46o
- E. 54o
The image in a pine-hole camera is always
- A. diminished
- B. enlarged
- C. upright
- D. inverted
- E. blurred
A ray of light is incidence on a plane mirror at an angle of 35o. What is the angle by the reflected ray with the surface of the mirror?
- A. 125o
- B. 70o
- C. 65o
- D. 55o
- E. 35o
A short chain is usual attached to the back of a petrol tanker trailing behind it to ensure that the
- A. petrol tanker is balanced on the wh eel
- B. heat generated by friction in the engine can be conducted to the floor
- C. charges generated by friction in the tanker can be conducted to the earth
- D. the tanker moves slowly as the chain touches the floor
- E. chain produces sound for the resonance of the tanker engine
Which of the following instruments can be used to compare the relative magnitudes of charges on two given bodies?
- A. The electrophorous
- B. Ebonite rod
- C. Proof plane
- D. Gold leaf electroscope
- E. Capacitor
All the heat generated by a current of 2A passing through a resistor of 6Ω for 25s is used to evaporate 5 g of a liquid at its boiling point. What is the specific latent heat of the liquid?
- A. 60 Jg-1
- B. 120 Jg-1
- C. 300 Jg-1
- D. 360 Jg-1
- E. 1500 Jg-1
A block of ice at its melting point is left on a table in the atmosphere and observed to melt gradually. Which of the following statements is true about the melting process?
- A. the reaction force of the table on the ice breaks the ice into water molecules
- B. heat extracted from the ice block makes the ice block cold
- C. the ice block absorbs heat from the atmosphere and its temperature rises
- D. the atmosphere absorbs heat from the ice block and its temperature falls
- E. the ice block absorbs heat from the atmosphere and its temperature remains constant as it melts
Calculate the heat energy required to vapourize 50g of water initially at 80oC if the specific heat capacity of water is 4.2Jg-1K (specific latent heat of vapourization of water is 2260Jg-1).
- A. 533000J
- B. 230000J
- C. 117200J
- D. 113000J
- E. 4200J
Which of the following substance is not a good conductor of electricity?
- A. Human body
- B. Glass
- C. Aluminium
- D. Earth
- E. Copper
Water in an open container boils at a lower temperature when heated at the top of a mountain than at sea-level because at the top of a mountain the
- A. relative humidity is higher than at sea-level
- B. rays of the sun adds more heat to the water
- C. temperature is lower than that at sea-level
- D. pressure is lower than that at sea-level
- E. pressure is more than that at sea-level
Which of the followiempeng statements is/are not correct?
- A. Evaporation takes place only at the surface of the liquid
- B. Boiling takes place throughout the volume of the liquid
- C. Evaportaion takes place at all temperatures
- D. Boiling takes place at a particular temperature for a liquid at a fixed external pressure
- E. The boiling point of a liquid is not affected by impurities
Which of the following surfaces will radiate heat energy best?
- A. Red
- B. White
- C. Black
- D. Yellow
- E. Blue
A thermometer has its stem marked in millimeter instead of degree Celsius. The lower fixed point is 30mm and the upper is 180mm. Calculate the temperature in degree celsius when the thermometer reads 45mm.
- A. 67.5oC
- B. 30.0oC
- C. 25.0oC
- D. 15.0oC
- E. 10.0oC
An engine raises 1000kg of water through a height of 60m in 20s. What is the power of the engine? (Take g = 10ms-2>).
- A. 120,000 W
- B. 30,000 W
- C. 333 W
- D. 300 W
- E. 30 W
Which of the following is a derived unit?
- A. Metre
- B. Coulomb
- C. Kilogram
- D. Second
- E. Ampere
The motion of the prongs of the sounding tuning fork is
- A. random
- B. translational
- C. rotational
- D. vibratory
- E. vibratory and rotational
A stone tied to a string is made to revolve in a horizontal circle of radius 4m with an angular speed of 2 rad per sec. With what tangential velocity will the stone move off the circle if the string is cut?
- A. 16.0 ms-1
- B. 8.0 ms-1
- C. 6.0 ms-1
- D. 2.0 ms-1
- E. 0.5 ms-1
A piece of cork floating on water is acted upon by the forces of…
- A. Weight and viscosity
- B. weight and upthrust
- C. upthrust and viscosity
- D. weight only
- E. upthrust only
A block of material of volume 20cm-3 and density 2.5gcm-3 is suspended from a spring balance with half the volume immersed in water. What is the reading of the spring balance? (Density of water = 1.0gcm-3).
- A. 8g
- B. 25g
- C. 30g
- D. 40g
- E. 50g
Which of the following is used to determine the relative density of the acid in a car battery?
- A. Hypsometer
- B. Hygrometer
- C. Manometer
- D. Hydrometer
- E. Spectrometer
A boy pulls a nail from the wall with a string tied to the nail. The string is inclined at an angle of 60o to the wall. If the tension in the string is 4N, what is the effective force used in pulling the nail?
- A. 2√3 N
- B. 4 N
- C. 4√3 N
- D. 8 N
- E. 2 N