Physics - Online Test
Q1. Is light a particle or a wave?
Answer : Option A
Explaination / Solution:
Light is an electro magnetic wave, it has dual nature and behave as both particle and wave
Q2. which of the following statements about earth's magnetism is correct
Answer : Option A
Explaination / Solution:
No Explaination.
Q3. Basic materials used in the present solid state electronic devices like diode, transistor, ICs, etc are
Answer : Option A
Explaination / Solution:
Semiconductors are materials that have electrical conductivity between conductors such as most metals and nonconductors or insulators like ceramics. Semiconductor material is used in the manufacturing of electrical components and used in electronic devices such as transistors and diodes.
Semiconductors are the basic materials used in the present solid state electronic devices like diode, transistor, ICs etc
Q4. According to Kepler’s Law of orbits:
Answer : Option A
Explaination / Solution:
The orbit of a planet around the Sun (or of a satellite around a planet) is not a perfect circle. It is an ellipse—a “flattened” circle. The Sun (or the centre of the planet) occupies one focus of the ellipse. A focus is one of the two internal points that help determine the shape of an ellipse. The distance from one focus to any point on the ellipse and then back to the second focus is always the same.
Q5. The position of an object moving in a straight line can be specified with reference to
Answer : Option A
Explaination / Solution:
To describe motion along a straight line, we can choose an axis, say X-axis, so that it coincides with the path of the object. We then measure the position of the object with reference to a conveniently chosen origin, say O, Positions to the right of O are taken as positive and to the left of O, as negative.
Q6. According to Maxwell’s equations
Answer : Option B
Explaination / Solution:
No Explaination.
Q7. In wave propagation
Answer : Option C
Explaination / Solution:
because in wave propagation particles only moves in perodic motion, particles get collide with their neighbouring particles then transfer energy to them and comes back to their normal stage. Now next particle which gain energy get into excited state and starts moving periodically and get collide to next adjacent particle and so on. Thus in wave propagation particles only transfer their kinetic energy and momentum. Hence particles does not move therefore there is no flow of matter but there is movement of disturbance.
Q8. Rigid body is a body which
Answer : Option C
Explaination / Solution:
A rigid body is an idealization of a solid body in which deformation or change in shape is neglected on application of deforming force.
Q9. electromagnetic induction i.e currents can be induced in coils (Select the best)
Answer : Option C
Explaination / Solution:
for electromagnetic induction magnet and coil both may move but relative motion between must be present
Q10. work function of a metal is the
Answer : Option B
Explaination / Solution:
When the light strikes on a metal surface, electrons on the surface of the metal get energy from the light and get emitted from the surface. There will be no photoemission from a metal surface below a certain frequency of light. For photoemission minimum frequency of incident light is required. This minimum energy of an electron is called work function.
