Physics - Online Test
Q1. A ray is an imaginary
Answer : Option D
Explaination / Solution:
No Explaination.
Q2. In which case of comparing solenoid and bar magnet there is no exact similarity?
Answer : Option B
Explaination / Solution:
No Explaination.
Q3.
Newton’s law of universal gravitation states that the gravitational force of attraction between any two particles of masses m1 and m2 separated by a distance r has the magnitude
Answer : Option D
Explaination / Solution:
According to Newton's law of universal gravitation, the force of attraction between two objects is directly proportional to the product of two masses and inversely proportional to the square of the distance between them
Q4. In a pure, or intrinsic, semiconductor, valence band holes and conduction-band electrons are always present
Answer : Option A
Explaination / Solution:
An intrinsic semiconductor, also called an undoped semiconductor or i-type semiconductor, is a pure semiconductor without any significant dopant species present. The number of charge carriers is therefore determined by the properties of the material itself instead of the amount of impurities. In intrinsic semiconductors the number of excited electrons and the number of holes are equal: n = p.
Q5. In Kinematics we study
Answer : Option C
Explaination / Solution:
Kinematics is a branch of classical mechanics that describes the motion of points, bodies (objects), and systems of bodies (groups of objects) without considering the mass of each or the forces that caused the motion.
Q6. The magnetic field of a plane electromagnetic wave travelling in +ve z direction is described by
Answer : Option D
Explaination / Solution:
No Explaination.
Q7. The quantity similar to extension or compression of the spring in sound wave propagation (air) is
Answer : Option B
Explaination / Solution:
As in air wave propagates in the form of compression (increase in density of air) and rarefaction (decrease in density of air).
Q8. Magnetic flux (ΦB) through a surface S is given by
Answer : Option D
Explaination / Solution:
if dS is area of an element of any arbitrary shape and magnetic field at this element is B.
The total magnetic flux through the surface is the sum of the contributions from the individual area elements.
Q9. In a general motion of a rigid body
Answer : Option A
Explaination / Solution:
In general motion of the body can be seen as the combination of pure translation of the center of mass and pure rotation of the body about the center of mass like the motion of a wheel.
Q10. In Photoelectric effect
Answer : Option B
Explaination / Solution:
In photoelectric effect emission of photoelectron takes place. So that photocurrent is flow in circuit.
