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Practice General science Common Questions and Answers

In circular motion the direction of velocity changes at _______ points.
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A constant retarding force of 20 N is applied to a body of mass 10 kg moving initially with a speed of 12 m s–1. How long does the body take to stop?...
A rocket with a lift-off mass 10,000 kg is blasted upwards with an initial acceleration of 5.0 m s–2. Calculate the initial thrust (force) of the blast....
Two billiard balls each of mass 0.02 kg moving in opposite directions with speed 5 m s−1 collide and rebound with the same speed. What is the impulse imp...
If a medium has a critical angle for total internal reflection from the medium to vacuum as 90°, what is the velocity of light in the medium? (Take c = 3....
What is the focal length of a double convex lens for which the radius of curvature of each surface is 30 cm and the refractive index of glass is 2.50 ?
Specific heat of aluminum when 26000 J of energy is supplied to 4 kg block and it's temperature rises from 25°C to 35°C is
Heat transfer horizontally within the atmosphere is called ?
Cathode rays when obstructed by metal cause emission of -
The base of an electric iron is brightly polished mainly -
Lux is the SI unit of -
Eclipses occur due to which optical phenomena?
Lamberts law is related to –
The method of protecting iron from rusting, by coating a thin layer of Zinc is called -
A boy sitting in a train moving with a uniform velocity drops a coin outside. A man standing outside the train will find the trajectory of the coin to be -
A piece of wood is held under water. The up thrust on it will be:
The ozone hole that has been detected lies in the atmosphere above –
Which one of the following wave- lengths of light is most effective in photosynthesis?
Alternating current is converted into direct current by a –
Which among the following is the fundamental quantity?
If the phase difference between two points is 120° for a wave with velocity of 360 m/ and frequency 500 Hz, then path difference between the two points is...
If no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant. Which law states this?
The force which opposes the relative motion between different layers of liquid or gases is called –
Who among the following developed the technology of under-ground nuclear explosion?
A man inside an artificial satellite feels weightlessness because the force of attraction due to earth is –
With the increase of pressure, the boiling point of any substance –
A bottle of sodalime is grasped by the neck and swung briskly in a vertical circle, Near which portion of the bottle do the bubbles collect?
When a detergent is added to pure water, its surface tension –
The final image in a simple microscope is –
A bomb at rest explodes into a large number of tiny fragments. The total momentum of all the fragments –
Speed of sound in air is unaffected by change in :
Who defined the law of gravitation?
What principle/law explains the working of the hydraulic brakes in automobiles?
The substance which conducts current in the solid state is –
The surface temperature of the Sun is nearly -
According to the theory of relativity, which of the following al-ways remains constant?
Electrostatic precipitator is used to control —
Metals are good conductors of electricity because –

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