Physics Mock Te...

Which one of the following law is based on the principle of conservation of electric charge?

Find the equivalent internal resistance and potential of the given circuit.

In an observation with a telescope, having aperture of lens D, if the wavelength of the light is tripled then the resolving power of telescope will-

The power loss in a conductor of resistance 'R' across which a potential difference of 'V' is equal to which of the following?

In an experiment of a single slit diffraction, the distance between the screen and the slit is increased by 5 cm. Then the angular width will -

The phenomenon which produces colours in a soap bubble is due to:

Find the potential difference across the resistance R₂ in the given circuit (Given R₁ = 15 ohm, R_2­ = 15 ohm, R₃ = 30 ohm and R₄ = 35 ohm)

The refractive index of a thin prism of prism angle 5° is 1.4. Find the angle of deviation of light ray falling on this prism.

Calculate the half life of a substance X, having decay rate constant of 2.31 × 10^-2

The frequency employed for TV broadcasting is normally of the order of - 

An atom has a mass number of 23 and atomic number 11. The number of protons is ________.

Which one of the following statements is NOT true about the sound waves?

The focal length of a mirror is f. If it is placed in water (n = 4/3), its focal length will be:

When a dielectric material of K dielectric constant is inserted between two parallel plate capacitor the electric field in between region of the plates 

Two current-carrying long wires of equal length are placed parallel to each other and separated by a small distance, if the current in both the wires is halved then the force per unit length on the wires will:

Identify the logic operation performed by the circuit given here.

Light with longest wave length in visible spectrum is _____?

The forbidden energy band gap in conductors, semiconductors and insulators are E_g1, E_g2 and E_g3 respectively. The relation among them is

Input characteristics of transistor in CE mode represents resistance that is of value:

Find the angle of dip at a certain place where the horizontal and vertical components of the earth’s magnetic fields are same.

An ideal transformer has 500 and the 1000 turns in the primary and the secondary coil. If the DC voltage of 120 V is applied to the primary coil, then the emf produced at the secondary coil will be:

De Broglie relation is represented by ______.

An electric dipole of dipole moment p is placed parallel to a uniform electric field E. The work done required to rotate the dipole by an angle 180° will be:

Which of the following statements is true with reference to Coulomb's law?

The torque experienced by a magnetic dipole, having dipole moment M, when placed in a uniform magnetic field of intensity B is:

In the circuit shown below 18 V Zener diode has zero Zener resistance and a knee current of 2 mA. The minimum value of R so that voltage across it does not fall below 18 V is:

A charged conductor is placed in an external electric field. The potential inside the conductor is

Write the frequency of EM waves spectrum in increasing order.

According to Gauss’s law, the electric field due to an infinitely long thin charged wire varies as:

The semiconductor used for the fabrication of visible LEDs must at least have a band gap of:

If the last band on the carbon resistor is absent, then the tolerance is

In a Van de Graaff Generator the inner sphere has higher _____________ than the outer sphere.

When a diode is reverse biased then the barrier height ____________________________.

In the circuit, the equivalent resistance between A and B is (Each resistance given in the diagram is R) :

Which of these v-I plots, is ohmic - 

The type of mirror used in the head lamps of cars is the:-

In Oersted's experiment, which type of electric source is used?

Excitation energy of a hydrogen like ion in its first excitation state is 40.8 eV. Energy needed to remove the electron from the ion ground state is _____

A charge particle of charge q is placed at a point. Find the magnitude of electric field at a distance of 1 m from the charge particle if the space is filled with a dielectric of dielectric constant 1.5. 

Two charges +q  and -q each of magnitude 6.0 × 10^-6 C forms a dipole. The separation between the charges is 4 × 10^-10 m. If this dipole is placed in a uniform electric field E = 3.0 × 10² NC^-1 at an angle of 30° with the field then calculate the value of torque on the dipole?

If the intensity and frequency of incident light is doubled then :

Which decay process does  \({_zX^A} \longrightarrow {_{z-1}Y^A} + {_{1}e^0} + {\nu}\) represents

How much magnification can be obtained at near point 25 cm by using a convex lens of focal length 10 cm?

If the radius of the potentiometer wire is doubled then effect on null point

How eddy current can be produced in a bulk piece of conducting material?

Which of the following modes is used for propagation of very high frequencies?

Refer to the following diagram to calculate how far (in cm) will the image be formed from the mirror. AB is the object.

A DC voltmeter is capable of measuring a maximum of 300 volts. If it is used to measure the voltage across a device operating at 220 volt AC supply, the reading of the voltmeter will be

Vinod is running in front of a plane mirror with speed 4 m /s. By what speed Vinod is being approached by his image?

Alternating current cannot be measured by DC ammeter because: