Practice General science Common Questions and Answers

• In circular motion the direction of velocity changes at _______ points.
• ...
• 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 –