A short chain is sometimes attached to the back of a petrol tanker to?
- A. generate more friction
- B. ensure the balancing of the tanker
- C. caution the driver when overspeeding
- D. conduct excess charges to the earth
Short sightedness can be corrected by what type of lens?
- A. Concave lens
- B. Convex lens
- C. Converging lens
- D. Mirrors
In the microscope, the eyepiece lens merely acts as?
- A. an inverter
- B. a refiner
- C. a diminisher
- D. a magnifier
An object placed at the bottom of a well full of clear water appears closer to the surface due to?
- A. diffraction
- B. reflection
- C. refraction
- D. polarization
Convex mirror are used as driving mirrors because images formed are?
- A. erect, virtual and diminished
- B. erect, real and diminished
- C. erect, virtual and magnified
- D. inverted virtual and diminished
An object of heights 5 cm is placed at 20 cm from a concave mirror of focal length 10 cm. the image height is?
- A. 20 cm
- B. 15 cm
- C. 10 cm
- D. 5 cm
An object of height 4cm is placed in front of a cuboid pinhole camera of size 6 cm. if the image formed is 2 cm high, how far is the object from the pinhole?
- A. 3.0 cm
- B. 8.0 cm
- C. 12.0 cm
- D. 16.0 cm
I. Total internal reflection of light.
II. Conservation of light energy.
III. Relative motion of the earth, sun and moon.
IV. Rectilinear propagation of light.
which of the above is a phenomenon of total solar eclipse?
- A. I and IV only
- B. II and IV only
- C. I and III only
- D. III and IV only
The fundamental property of a propagating wave which depends only on the source and not the medium of propagation is the?
- A. wavelength
- B. harmonics
- C. frequency
- D. velocity
Given the progressive wave equation y = 5 sin (2000 πt – 0.4x), calculate wave length
- A. 12.4 m
- B. 15.7 m
- C. 17.5 m
- D. 18.6 m
In a good thermos flask, heat loss is reduced through the following features EXCEPT?
- A. the lens surface
- B. the insulating cork
- C. silvered walls
- D. the cork lid
If the partial pressure of water vapour at 27°C is 18 mm Hg and the saturated vapour pressure of the atmosphere at the same temperature is 24 mm Hg, the relative humidity at this temperature is?
- A. 25%
- B. 33%
- C. 75%
- D. 82%
A block of aluminum is heated electrically by a 25 W heater. if the temperature rises by 10°C in 5 minutes, the heat capacity of the aluminum is?
- A. 850 JK-1
- B. 750 JK-1
- C. 650 JK-1
- D. 500 JK-1
A sealed flask contains 600cm3 of air at 27°C and is heated to 35°C at constant pressure. The new volume is?
- A. 508 cm3
- B. 516 cm3
- C. 608 cm3
- D. 616 cm3
During summer, the balance wheel of a clock expands.what effect does this have on the accuracy of the clock?
- A. the clock gians time
- B. the accuracy of the clock is not affected
- C. the clock losses time
- D. the clock stops working
The thermometric properties of a thermocouple is the change in?
- A. equivalent resistance
- B. electromotive force
- C. colour
- D. pressure
An empty density bottle weighs 2 N. if it weighs 5 N when filled with water and 4 N when filled with olive oil, the relative density of olive oil is?
- A. (1)/3
- B. (2)/3
- C. (1)/5
- D. (2)/5
When cold water is poured on a can containing hot water, the can collapses because the?
- A. steam condeses and occupies the partial vacuum in the can
- B. external air pressure counter balances the pressure within the can
- C. steam expands to occupy the vacuum remaining in the can
- D. external pressure becomes greater than the pressure within the can.
In the hare’s apparatus, water rises to a height of 26.5 cm in one limb. if a liquid rises to a height of 20.4 cm in the other limb, what is the relative density of the liquid?
- A. 0.8
- B. 1.1
- C. 1.2
- D. 1.3
A spring of force constant 500 NM-1 is compressed such that its length shortens by 5cm. The energy stored in the spring is?
- A. 0.625 J
- B. 6.250 J
- C. 62.500 J
- D. 625.000 J
A motorcycle of mass 100kg moves round in a circle of radius 10m with a velocity of 5 ms-1. find the coefficient of friction between the road and the tyres.
- A. 25.00
- B. 2.50
- C. 0.50
- D. 0.25