SS3: Physics – 2nd Term Examination

What causes the Earth’s magnetic field?

The maximum angle of inclination of a layer of a rock with the horizontal is _________

Which of the following is used to determine the direction of magnetic field in a current carrying conductor?

According to Flemming’s left-hand rule, the index finger denotes?

According to Flemming’s left-hand rule, the middle finger denotes?

The relation between the direction of force and the direction of magnetic field is _________

Magnetic field is strong when____________

The force existing between two infinite parallel conductors is inversely proportional to ________

The angle of dip at equator is

The force per unit length existing between two infinite parallel conductors is given by ___________

Which among the following, is the correct expression for force in a current carrying conductor if magnetic field is perpendicular to it?

When the current in a current carrying conductor increases, what happens to the force in the conductor which is at right angles to the magnetic field?

If the intensity of the magnetic field is 100T, the length of the conductor is 10m and the magnitude of force perpendicular to the magnetic field is 10kN,calculate the current in the conductor.

If the intensity of the magnetic field perpendicular to current carrying conductor is 100T, the length of the conductor is 3m and the current in the conductor is 10A, calculate the magnitude of force perpendicular to the electric field.

An E.M.F. can be induced by _________

What happens to the current in a coil while accelerating a magnet inside it?

The total number of magnetic field lines passing through an area is termed as

What is emf?

According to Faraday’s laws of electromagnetic induction, an emf is induced in a conductor whenever ______________.

Direction of induced emf is determined by __________

“The direction of an induced e.m.f. is always such that it tends to set up a current opposing the motion or the change of flux responsible for inducing that e.m.f.”, this is the statement for?

Which, among the following, is the formula for induced emf?

North pole induces __________

What is the principle of the transformer?

Voltage induced in secondary coil of transformer is given by

Function of a transformer is to __________

A transformer cannot work on the DC supply because __________________

Turns ratio of the transformer is directly proportional to ____________

It is possible to attain maximum efficiency in a transformer when the ______

The efficiency of a 20 KVA, 2000/200 V, single phase transformer at unity pf is 98%. The total losses at this condition is?

If Im is the maximum value of a sinusoidal voltage, what is the instantaneous value?

What is the correct expression for the rms value of current?

If maximum value of current is 5√2 A, what will be the value of RMS current?

If the maximum value of the current is 5√2 A, what will be the value of the average current?

What is the correct expression of ω?

Find the value of ω if the frequency is 5Hz?

When one sine wave passes through the zero following the other, it is _________

Find the value of the instantaneous voltage if the resistance is 2 ohm and the instantaneous current in the circuit is 5A.

If the impedance of a LC circuit is 8.54 Ohms and the r.m.s. voltage of the source V_rms = 110V, what is the r.m.s. current?

A resistance of 7 ohm is connected in series with an inductance of 31.8mH. The circuit is connected to a 100V 50Hz sinusoidal supply. Calculate the current in the circuit.

Which, among the following, is the correct expression for φ.

For an RL circuit, the phase angle is always ________

What is the resonant frequency of ac circuit?

What is impedance at resonance?

What is the resonance condition?

If in an alternating current circuit, resistance is 5 ohm, capacitive reactance is 12 ohm, what is the impedance?

If in an alternating current circuit, capacitance of 30 µF is connected to a supply of 200V, 50Hz. Find the current in the circuit.

Find the total voltage applied in a series RLC circuit when i = 3mA, V_L = 30V, V_C = 18V and R = 1000 ohms.

In an AC circuit, resistance 50 Ω, inductance 0.3 H and capacitance 15 μF is connected to an AC voltage source 25 V, 50 Hz. Determine the inductive reactance in the circuit.

Around 1911, Rutherford suggested a planetary model of atomic structure. Which of the following was not a proposition of this model?

Which of the Bohr’s postulates was incorrect?

Number of atomic orbitals in nth shell is:

_________ have the same mass number, but different nuclear charge.

The half-life period of a radioactive substance is best determined by counting the number of alpha particles emitted per second in a Geiger Muller counter from its known quantity. If the half-life period of a radioactive substance is one month, then?

A radioactive isotope undergoes decay with respect to time following __________ law.

The half-life period of a radioactive element is 100 days. After 400 days, one gm of the element will be reduced to __________ gm.

The uncertainty in the location of a particle moving with velocity 7.28 X 10⁷m /s is two times its de-Broglie wavelength. What is the uncertainty in measuring the velocity?

The ratio of neutrons to protons of an element having a mass number and atomic number of 80 and 40 respectively is

The immediate products of fission are called

During Einstein’s Photoelectric Experiment, what changes are observed when the frequency of the incident radiation is increased?

How does the intensity affect the photoelectric current?

Photoelectric emission could be explained by the ____________

The work function of lithium is 2.5 eV. The maximum wavelength of light that can cause the photoelectric effect in lithium is? Take Plank constant, h = 6.626 x 10^-34 J/s, c = 3 x 10⁸ m/s and Å = 10^-10 m.

Light of wavelength 3500 Å is incident on two metals A and B. Which metal will yield more photoelectrons if their work functions are 5 eV and 2 eV respectively?

The Kinetic energy of a photoelectron emitted on shining a light of wavelength 6.2 x 10^-6m on a metal surface of work function 0.1 eV is

What is the effect of intensity on the stopping potential?

A radio station broadcasts its programme at 219.3 metre wavelength. Determine the frequency of radio waves if velocity of radio waves is 3×10⁸ m/s.

The binding energy of an electron to a proton (i.e., hydrogen atom) is 13.6 eV. The loss of mass in the formation of one atom of hydrogen is _____________

Calculate the de-Broglie wavelength of an electron which has been accelerated from rest on application of potential of 400volts.

Calculate the minimum uncertainty in the momentum of a 4He atom confined to 0.40 nm.