Practice General science Common Questions and Answers

• Which state does not share a common border with Haryana?
• Marbles come under which category of rockes?
• In order to use the transistor as an amplifier, it has to operate in the____ region
• Two long parallel conductors are placed 8mm apart from each other carrying a current of 120 Amperes. What will be force per meter length of each one?
• An electric dipole when held at 30 ֯ with respect to a uniform electric field of 103 N/c experience a torque of 12 × 10-26 Nm. Calculate dipole moment of...
• A 5 V battery of negligible internal resistance is connected across a 190 V battery and a resistance of 37 Ω as shown in the figure. Find the value of th...
• A potentiometer wire of length 1 m has a resistance of 5 Ω. It is connected to a 6 V battery in series with a resistance of 10 Ω. Determine the emf of ...
• A plane electromagnetic wave travels in vacuum along the z-direction. If the frequency of the wave is 20 MHz, what is its wavelength?
• What is the velocity of light in a diamond if the refractive index of diamond with respect to vacuum is 2.5?
• The correct option, if speeds of gamma rays, X-rays and microwave are Vg, Vx an Vm respectively will be ...
• Electromagnetic waves travelling in a medium having relative permeability μr = 1.2 and relative permittivity Er = 0.012. The speed of electromagnetic wave...
• In half-wave rectifier, what is the output frequency if the input frequency is 40 Hz. What is the output frequency of a full-wave rectifier for the same in...
• In an n-type silicon, which of the following statements is true:
• When a forward bias is applied to a p-n junction, it
• The refractive index of glass is 1.5. What is the speed of light in glass? Speed of light in vacuum is 3.0 x 108 m/s.
• The storage battery of a car has an emf of 15 V. If the internal resistance of the battery is 0.5 Ω, what is the maximum current that can be drawn from th...
• A battery of emf 12 V and internal resistance 4 ohm is connected to a resistor. If the current in the circuit is 0.6 A, what is the resistance of the resis...
• A heating element using nichrome connected to a 230 V supply draws an initial current of 3.2 A which settles after a few seconds to a steady value of 2.8 A...
• Is Ohm’s law universally applicable for all conducting elements?
• 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?