Physics - Online Test
Q1. If a positive charge moves in the direction of the electric field
Answer : Option B
Explaination / Solution:
A positive charge experiences a force in the direction of the field. If it moves in the direction of the field, positive work is done by the electric field on the charge. Potential energy of the charge increases only when an external source does work on the charge against the direction of the field- eg: when the charge is moved against the direction of the field
Q2.
The pressure at a depth of h in a fluid of density at a place where the acceleration due to gravity is g and the pressure at h=0 is is given by
Answer : Option D
Explaination / Solution:
According to Pascal's Law,
Change in Pressure (P-P0) = hg
if h=0 then P-P0 = 0
and P=P0
Q3. In which case are the atoms relatively rigidly fixed?
Answer : Option C
Explaination / Solution:
Atoms in a gas are well separated with no regular arrangement. Atoms vibrate and move freely at high speeds
Atoms in a liquid are close together with no regular arrangement. Atoms vibrate, move about, and slide past each other.
Atoms in a solid are tightly packed, usually in a regular pattern. Atoms vibrate (jiggle) but generally do not move from place to place.
Q4. Refraction is
Answer : Option B
Explaination / Solution:
No Explaination.
Q5. Nuclear species or nuclides are shown by the notation ____________ where X is the chemical symbol of the species.
Answer : Option C
Explaination / Solution:
Atomic mass number (total number of nucleons) and the atomic number (number of protons) of the species are given by A and Z, respectively.
Q6. correct unit of magnetic field is
Answer : Option D
Explaination / Solution:
The SI unit of magnetic field is Tesla (T)
Q7. If P is the pressure, μ is the number of moles in the sample, T the temperature and V the volume of gas, ideal-gas equation is
Answer : Option A
Explaination / Solution:
V∝NTPPVNT=kN=μNAPVμT=NAk=RPV=μRT
Q8. Derived units
Answer : Option B
Explaination / Solution:
Derived units are units which may be expressed in terms of base units by means of mathematical symbols of multiplication and division.
For example, the SI derived unit of area is the square metre (m2), and the SI derived unit of density is the kilogram per cubic metre (kg/m3 or kg m-3).
The names of SI units are written in lowercase.
Q9. It is observed in a potentiometer experiment that no current passes through the galvanometer, when the terminals of the cell are connected across a certain length of the potentiometer wire. On shunting the cell by a 2 Ω resistance, the balancing length is reduced to half. The internal resistance of the cell is
Answer : Option B
Explaination / Solution:
The internal resistance of the cell is given by:
Q10. for any periodic motion with a period T and displacement = f(t)
Answer : Option A
Explaination / Solution:
No Explaination.
