When a capacitor is charged to 20C on each plate, the energy stored by it is 40J. At what charge will it store half of this energy?
A man moves 20m North, then 12m East and finally 15m South. His displacement from the starting point is now
I. The earth is not spherical but elliptical in shape
II. Variation in latitude and longitude
III. Rotation of the earth on its axis
IV. Variation in the density of the earth
On which combination of the above does the weight of an object vary on the earth's surface?
When an athlete perspires after running, he loses heat through _____
The escape velocity of a body on earth is 1100m/s. The body has an acceleration due to gravity of the same value on earth and in another planet. What is the velocity on the other planet if the distance on the planet is twice its distance on earth?
The frequency of the beats produced when two turning forks of frequencies 258Hz and 270Hz are sounded close to each other is
When a ship sails from salt water into fresh water, the fraction of its volume above the water surface will
The velocity of sound in air is not affected by which of the following factors during propagation?
The focal length of a concave mirror is 2.0cm. if an object is placed 8.0cm from it, the image is at
A spherical metal ball of radius 1 cm falls with a steady velocity of 2 m/s down a viscous liquid in a container. If the viscous force of the liquid is 0.02 N at room temperature of viscosity of the liquid (π = 3.142)
The energy in the nucleus of atoms produce heat which can be used to generate _____
If a virtual image appears larger than the object and is formed on the same side as the object, the possible mirror/lens used is?
A given barometric altimeter reads zero Pascal
Which of these electrical instrument or machines does not rely on the magnetic effect of current for its working?
The half-life of an element is 24 hours. What fraction of the atoms has disintegrated in 72 hours?
One of the conditions necessary for an object to be in equilibrium when acted upon by a number of parallel forces is that the vector sum of the forces is
A boy in a barber's shop sits between two parallel mirrors. The number of images observed by him will be _____
A cell of EMF 6 Volts and internal resistance 1 ohms is connected in series with a 3 ohms resistor. If another identical cell is connected in parallel with the first, what is the total current flowing in the circuit?
When a telescope is in normal use, the final image is at
The small droplets of water that form on the grass in the early hours of the morning is
Which of the following is not affected by friction in machines?
The property of waves which can be used to differentiate light wave from sound wave is _____
It takes 4 minutes to boil a quantity of water electrically. How long will it take to boil the same quantity of water using the same heating coil but with the current double?
The thermal expansion of a solid is an advantage in
Which of the following statements is not correct?
Binding energy is _____
What is the force on a segment of wire that is 0.5m long and has a current of 2A, when placed in a magnetic field of 2T at an angle of 30° to the field?
The heat required to raise a mass of a substance through 1k is known as
A ball of mass 0.5kg moving at 10 m/s collides with another ball of equal mass at rest. If the two balls move off together after the impact, calculate the velocity which they do this
An engineer intends to deviate a light ray from its path by 120o through reflection from a plane mirror. Calculate the angle of incidence
Which of the following is a scalar quantity?
Insulators cannot conduct electricity because
The mode of heat transfer that is electromagnetic in nature is _____
In a semiconductor, the band gap is the energy difference between:
One of the following is a secondary cell
Total internal reflection occurs when light moves from?
A satellite revolving around the earth is kept on its orbit by
Which of the following can be used to measure human body temperature?
The process of energy production in the sun is
A car travels 8 km due North then 5 km at 60° east of North. What is its displacement from the starting point?
