List of top Questions asked in Jharkhand Polytechnic

Which of the following correctly lists good conductors of electricity?
Which of the following is dynamically the most stable state of carbon?
Ohm's law states that
A battery of 10 volt carries 20,000 C of charge through a resistance of \(20\ \Omega\). The work done in 10 seconds is
Which instrument can be used to measure potential difference across a resistor?
An ideal ammeter -
The defective eye of a person has near point 0.5 m and distant point 3 m. The power for corrective lens required for reading is :
Bi-focal lenses are required to correct
The danger signals installed at the top of tall buildings are red in color. These can be easily seen from a distance because among all other colors, red light
A person uses a convex lens of focal length 20 cm in spectacles, the power of lens will be :
A few phenomena of light are given below :
(I) Advance sunrise and delayed sunset
(II) Twinkling of stars
(III) Wavering of objects seen through a turbulent stream of hot air
(IV) Blue colour of sky
Which of the above phenomena are due to atmospheric refraction?
When the object is placed very close to the lens, the image formed is virtual, erect and
Arrange the following parts of the human eye in the order that light passes through them :
1. Cornea
2. Retina
3. Pupil
4. Crystalline lens
Large number of thin strips of black paper are made on the surface of a convex lens of focal length 20 cm to catch the image of a white horse. The image will be
Match the positions of the object (Column A) with the corresponding positions of the image formed by a convex lens (Column B).
When object moves closer to convex lens, the image formed by it shifts :
The lens formula is given by :
\[\frac{1}{f} = \frac{1}{v} - \frac{1}{u}\]
Which of the following correctly identifies each term in the formula?
When electric current is passed, electrons move from:
If a man's face is 25 cm in front of a concave shaving mirror producing erect image of 1.5 times the size of face, focal length of the mirror should be:
What is the size of the image formed when the object is at infinity in front of a concave mirror?
An object is placed at 60.0 cm in front of a concave mirror of focal length 30 cm. At what distance from the mirror should a screen be placed to obtain a sharp image?
What does the magnification produced by a spherical mirror represent?
The Sun is visible to us about 2 minutes before the actual sunrise and about 2 minutes after the actual sunset because of
The aperture of a spherical mirror refers to:
Magnification produced by a rear view mirror fitted in vehicles: