VITEEE Physics Test - 4

A cell of e.m.f. E is connected with an external resistance R, then p.d. across cell is V. The internal resistance of cell will be

The resistance of a cell does not depend upon

If sky wave with a frequency of 50 MHz is incident on D-region at an angle of 30^o, then angle of refraction is

The resistance of a wire of iron is 10 ohms and temp. coefficient of resistivity is 5x10^-3∕℃. At 20^oC it carries 30 milliamperes of current. Keeping constant potential difference between its ends, the temperature of the wire is raised to 120^oC. The current in milliamperes that flows in the wire is

A wire of resistance 1 Ω is stretched to double its length. The resistance will become

Choke coil works on the principle of

The wing span of an aeroplane is 36 m. If the plane is flying at 400 km/h, the e.m.f. induced between the wings tips is (assume V=4X10)

The electromagnetic waves are produced by

A cylinder of radius R and length L is placed in a uniform electric field E parallel to the cylinder axis, the total electric flux for the surface of the cylinder is

Two charges -10 C and + 10 C are placed 10cm apart. Potential at the centre of the line joining two charges is

What will be the ratio of de Broglie wavelengths of proton and α-particle of same energy

A body of capacity 4 μ F is charged to 80V and another body of capacity 6 μ F is charged to 30V. When they are connected the energy lost by 4 μ F is

A wire of radius r has resistance R. If it is stretched to a radius of 3r/4, its resistance becomes

An electric dipole of dipole moment p is placed in uniform electric field of strength E. If θ is the angle between p and E, then potential energy of the dipole becomes maximum, when θ is

A capacitor of 10 μF charged up to 250 volts is connected in parallel with another capacitor of 5 μF charged up to 100 volts. The common potential is

Magnetic effect of current was discovered by

Substances which have identical chemical properties but differ in atomic weight are called

Number of neutrons in C¹² and C¹⁴ are

In a nuclear reactor heavy water is used as a

The work function of a substance is 4.0 eV. The longest wavelength of light that can cause photoelectron emission from this substance is approximately

When plate voltage in diode valve is increased from 100 volt to 150 volt then plate current increases from 7.5 mA to 12 mA. The dynamic plate resistance will be

A prism of refractive index ' μ ' and angle 'A' is placed in the minimum deviation position. If the angle of minimum deviation is 'A', then the value of 'A' in terms of ' μ ' is

In a good conductor the energy gap between the conduction band and the valence band is

To make P-type semiconductor, the impurity to be mixed with pure germanium will be

In forward bias the width of potential barrier in a p-n junction diode

In Young's experiment of double slit, the intensity of central bright band is ---- times the individual intensities of the interfering waves

Two waves of intensities I and 4 I superimpose, then maximum and minimum intensities are

If a star is moving towards the earth, then the spectrum lines are shifted towards