WorksheetsNATIONAL LEVEL ONLINE QUIZ COMPETITION ON PHYSICS
Total questions: 30
Worksheet time: 20mins
Which among the following temperature scale is based upon absolute zero?
Celsius
Fahrenheit
Kelvin
Rankine
The surface considered for Gauss’s law is called
Closed surface
Spherical surface
Gaussian surface
Plane surface
The force per unit charge is known as
electric flux
electric field
electric current
electric current
Electric field lines provide information about
field strength
direction
nature of charge
all of these
The SI unit of electric flux is
N C-1 m-2
N C m-2
N C-2 m2
N C-1 m2
SI unit of permittivity of free space is
Farad
Weber
C2N-1 m-2
C2N-1 m-2
Consider a uniform electric field in the z-direction. The potential is a constant
for any x for a given z
for any y for a given z
on the x-y plane for a given z
all of these
In a region of constant potential
the electric field is uniform
the electric field is zero
there can be no charge inside the region
both (b) and (c) are correct
A test charge is moved from lower potential point to a higher potential point. The potential energy of test charge will
remain the same
increase
decrease
become zero
Dielectric constant for a metal is
zero
infinite
1
10
An electric heater is connected to the voltage supply. After few seconds, current gets its steady value then its initial current will be
equal to its steady current
slightly higher than its steady current
slightly less than its steady current
zero
In parallel combination of n cells, we obtain
more voltage
more current
less voltage
less current
When a metal conductor connected to left gap of a meter bridge is heated, the balancing point
shifts towards right
shifts towards left
remains unchanged
remains at zero
A charge is moving across a junction, then
momentum will be conserved
momentum will not be conserved
at some places momentum will be conserved and at some other places momentum will not be conserved
none of these
The earth behaves as a magnet with magnetic field pointing approximately from the geographic
North to South
South to North
East to West
West to East
The strength of the earth’s magnetic field is
constant everywhere
zero everywhere
having very high value
vary from place to place on the earths surface
Let the magnetic field on earth be modelled by that of a point magnetic dipole at the centre of earth. The angle of dip at a point on the geographical equator is
always zero
positive, negative or zero
unbounded
always negative
The vertical component of earth’s magnetic field . at a place is √3 times the horizontal component
the value of angle of dip at this place is
30°
45°
60°
90°
The primary origin of magnetism lies in
atomic current and intrinsic spin of electrons
polar and non polar nature of molecules
pauli exclusion principle
electronegative nature of materials
A spectral line is emitted when an electron
jumps from lover orbit to higher orbit
jumps from higher orbit to lower orbit
rotates in a circular orbit
rotates in an elliptical orbit
At the time of total solar eclipse, the spectrum of solar radiation would be
a large number of dark Fraunhoffer lines
a large number of dark Fraunhoffer lines
All Fraunhofer lines changed into brilliant colours
None of these
In an atom, the two electrons move round the nucleus in circular orbits of radii R and 4R. The ratio of the times taken by them to complete one revolution is
18
14
4
8
The ratio of the energies of the hydrogen atom in its first to second excited state is
14
49
94
4
To explain fine structure of spectrum of hydrogen atom, we must consider.
a finite size of nucleus
the presence of neutrons in the nucleus
spin angular momentum
orbital angular momentum
How does the energy difference between two consecutive energy levels vary on the quantum number n increases?
does not change
decrases
increases
may increase or decrease
Beta rays emitted by a radioactive material are
neutral particles
charged particles emitted by nucleus
electromagnetic radiations
electrons orbiting around the nucleus
The packing fraction for 147N isotope whose mass is 14.003 amu is:
0.9
7.8 × 10-3
1.0002
2.1 × 10-4
The binding energy per nucleon is almost constant for many nuclei. It shows that nuclear forces are
Charge independent
saturated in nature
short range in nature
attractive in nature
When the number of nucleons in nuclei increases, the binding energy per nucleon numerically
increases continuously with mass number
decreases continuously with mass number
First increases and then decreases with increase of mass number
Remains constant with mass number
For an atomic reactor being critical, the ratio (k) of the average number of neutrons produced and used in chain reaction
depends upon the mass of the fissionable material.
is greater than one
is less than one
is equal to one
