Which of the following is not true about semi-conductor?
The minimum energy necessary to remove an electron from a given atom at infinity is called ______.
Find the de Broglie wavelength of a 0.01kg pallet having a velocity of 10m/s and energy: 6.63 x10³⁴js
A set-up transformer is designed to operate from a 25v supply. If the transformer is 80% efficient, determine the current in the primary coil when the output terminals are not connected to 240v 100w lamp
An object of mass 0.2kg and density 600kgm3 is suspended with a string so that it is immersed in paraffin of density 900kgm-3. Find the tension in the string
A rocket burns fuel at the rate of 20kgs-¹ and eject it with a velocity of 5.0 x 10³ m/s-¹ . Calculate the thrust exerted by gas on the rocket.
Which of the following pairs consist fundamental quantities only?
One of the limitations of Thomson's model of the atom is that it does not explain.
A wire carrying a current of IGA and 2.5m length is placed in a field of flux density 0.14T. what is the force of the wire if it is placed at 600 to field?
In the transformer, the magnetism of the core is repeatedly reverse by themagnetic field resulting in energy as heat. The loss is called _____.
Which of the following is a scalar quantity?
What change in velocity would produce a body of mass 4kg if a constant force of 16N acts on it for 2s?
A body accelerates uniformly from rest at the rate of 3m/s2 for 8s. Calculate the distance covered by the body during the acceleration.
Which of the following has the same unit as the moment of a force?
Which of the following will reduce the frequency of oscillation of a simple pendulum?
A barometer can be used in determining the length of a
ii. Depth of a mine
Iii. Dew point
Which of the following is/are
Which of the following colours of surfaces will radiate heat energy best?
A gas which obeys Charles law exactly has a volume of 283cm³ at 10˚c. What is its volume at 30˚c?
A real image of an object formed by a converging lens of focal length 15cm is 3 times the size of the object. What is thedistance of the object from the lens?
How far from a cliff should a boy stand to hear the echo of his clap 0.9s later? (speed of sound in air= 330m/s)