Physics - Online Test
Q1. Electric potential energy of two point charges q and q0 is
Answer : Option B
Explaination / Solution:
Potential energy of a system of charges is the work done in assembling the charges. Force between two charges q and q0 placed at a distance r apart is Potential energy of the charges is given by
Q2. Density is defined as
Answer : Option C
Explaination / Solution:
Density is defined as the compactness of substance.
Mathematically,
Density(D)=
Q3. Kinetic theory
Answer : Option B
Explaination / Solution:
The kinetic theory describes a gas as a large number of submicroscopic particles (atoms or molecules), all of which are in constant rapid motion that has randomness arising from their many collisions with each other and with the walls of the container.
It will applicable only for gases
Q4. What is the unit of mass when measured on the atomic scale?
Answer : Option D
Explaination / Solution:
The unified atomic mass unit (u) is defined as one twelfth of the mass of an unbound neutral atom of carbon-12 in its nuclear and electronic ground state and at rest.
Q5. According to Cartesian sign convention.
Answer : Option C
Explaination / Solution:
No Explaination.
Q6. Which of the following is most general charachteristic of Magnetic field
Answer : Option A
Explaination / Solution:
A moving charge experiences a force in a magnetic field called magnetic Lorentz force given by.This force acts only if the particle (i) has charge q(ii) has a non zero velocity v and (iii) does not move parallel or anti parallel to the magnetic field B. A current carrying conductor placed in a magnetic field experiences a force given by
Q7. Heat flows from one body to another if
Answer : Option B
Explaination / Solution:
Heat is the amount of energy flowing from one body of matter to another spontaneously due to their temperature difference.
Q8. Measurement of a physical quantity is essentially the
Answer : Option B
Explaination / Solution:
The Measurement of a given quantity is essentially an act or result of comparison between a quantity whose magnitude (amount) is unknown, with a similar quantity whose magnitude (amount) is known, the latter quantity being called a Standard.
Q9. Two cells of 1.25 V and 0.75 V are connected in series with anode of one connected to anode of the other . The effective voltage will be
Answer : Option B
Explaination / Solution:
The cells are in opposition.
Q10. Oscillatory motion is best described by
Answer : Option A
Explaination / Solution:
In oscillatory motion object moves to and fro about mean position periodically or after a particular interval of time.All oscillatory motions are periodic in nature.
