An electric lamp marked 240v, 60 W is left to operate for an hour. How much energy is generated by the filament?
- A. 3.86 x 105J
- B. 3.56 x 105J
- C. 1.80 x 104J
- D. 2.16 x 105J
If negative charges are induced on an electroscope and a positively charged rod is brought near the cap of the electroscope, the leaves will?
- A. close up
- B. become positively charged
- C. become negatively charged
- D. open further
Which of the following is a secondary colour
- A. blue
- B. orange
- C. red
- D. green
The ability of the human eye to focus object on the retina is referred to as the power of?
- A. interference
- B. diffraction
- C. accomodation
- D. superposition
When light passes through two media x and y of refraction indices 1.51 and 1.33 respectively, the speed of light in
- A. x is same as in y
- B. x and y is same as in vacuum
- C. x is higher than in y
- D. y is higher than in x
If the refractive index of crown glass is 1.51, its critical angle is?
- A. 48.6°
- B. 22.5°
- C. 41.5°
- D. 45.0°
Calculate the position of an object placed in front of a convex mirror having focal length of 12 cm such that an image is formed 6 cm away from the mirror
- A. 4. 0 cm
- B. 3. 0 cm
- C. 12.0 cm
- D. 9.0 cm
An object is placed 5 cm from the pole of a concave mirror. if the focal length of the mirror is 10 cm. what is the image distance?
- A. 10 cm in front of the mirror.
- B. 5 cm in front of the mirror
- C. 10 cm behind the mirror
- D. 5 cm behind the mirror
I. Moon.
II. Sun.
III.street light.
IV. stars.
Which of these are natural sources of light?
- A. II, III, and IV only
- B. I, II and III only
- C. III and IV only
- D. II and IV only
Musical instruments playing the same note can be distinguished from one another owing to the differences in their?
- A. quality
- B. pitch
- C. intensity
- D. loudness
Metal cables are used as telephone wires because?
- A. they are cheap
- B. they are sourced locally
- C. the speed of sound in them is very low
- D. the speed of sound in them is very high
A man standing 2 m from a charcoal fire is warmed mainly by?
- A. convection
- B. radiation
- C. refraction
- D. conduction
It is observed that water will wet a clean glass because the?
- A. cohesion of water to glass is stronger than the cohesion of water molecules
- B. adhesion of water molecules is weaker than the cohesion of water to glass
- C. cohesion of water to glass is weaker than the cohesion of water molecules
- D. adhesion of water molecules is stronger than the cohesion of water molecules
A heating coil rated 1000 W is used to boil off completely 2 kg of boiling water. The time required to boil the water is?
[Special latent heat of Vaporization of water = 2.3 x 10\(^6\) Jkg-1]
- A. 1.15 x 104s
- B. 1.15 x 103s
- C. 4.6 x 104s
- D. 4.6 x 103s
If the pressure of the vapor on top of an enclosed liquid is equal to the atmospheric pressure, what will be the temperature of the liquid enclosed?
- A. room temperature
- B. boiling point
- C. freezing point
- D. standard temperature
An electric heater rated 220v, 1000 w is immersed into a bucket full of water, calculate the mass of water if the temperature changes from 30°c to 100°c and the current flows for 300seconds.
[specific heat capacity of water = 4200 jkg-1 K-1]
- A. 4.28 kg
- B. 42.86 kg
- C. 1.02 kg
- D. 7.14 kg
At 4°c, the volume of a fixed mass of water is?
- A. constant
- B. minimum
- C. maximum
- D. zero
The thermometer whose reading is indicated by a change in color of its thermometric property is the?
- A. bi-metalic strip thermometer
- B. thermocouple
- C. platinium resistance thermometer
- D. optical pyrometer
A plastic sphere floats in water with 50% of its volume submerged. if it floats in glycerine with 40% of its volume submerged,the density of the glycerine is?
- A. 1400 kgm-3
- B. 1250 kgm-3
- C. 500 kgm-3
- D. 1000 kgm-3
If a load of mass 10N stretched a cord by 1.2cm, what is the total work done?
- A. 6.0 x 10-2J
- B. 7.6 x 10-2J
- C. 1.8 x 10-2J
- D. 6.6 x 10-2J
I. Density of the liquid.
II. Acceleration due to gravity.
III. Type of container of the liquid.
IV. The constituents of the liquid.
which of the above conditions will NOT affect the pressure of fluid?
- A. I and III only
- B. II and III only
- C. III and IV only
- D. I and II only