List of top Physics Questions asked in GUJCET

What is the de Broglie wavelength associated with an electron accelerated through a potential difference of 64 volts?

The ratio of halflife and average life for a radioactive sample is_____.

An electron, an \(\alpha\)-particle and a proton have the same kinetic energy. which of these has the longest de Broglie wavelength? 

The resistance of 1 N solution of acetic acid is 250 $\Omega$, when measured in a cell of cell constant $1.15 cm ^{-1}$. The equivalent conductance (in $ohm^{-1} cm^2 equiv^{-1}) $of 1 N acetic acid is

Electrical force between two point charges is 200 N. If we increase 10% charge on one of the charges and decrease 10% charge on the other, then electrical force between them for the same distance becomes

Advantages of optical fibre communications over two wire transmission line or co-axial cable transmission are

If 20 J of work has to be done to move an electric charge of 4 C from a point, where potential is 10 V to another point, where potential is V volt, find the value of V.

There are $ 2.0 \times 10^{24} $ molecular dipoles in a paramagnetic salt. Each has dipole moment $ 1.5 \times 10^{23} Am^2 $. Find maximum (saturation) magnetization in the specimen.

A bar magnet of magnetic moment M, is placed in a magnetic field of induction B. The torque exerted on it is

A pure Ge specimen is doped with Al. The number density of acceptor atoms is approximately 10$^{21} m^{-3}$. If density of electron hole pair in an intrinsic semiconductor is approximately 10$^{19} m^{-3}$, the number density of electrons in the specimen is

First order derivation of thermo emf produced in thermo-couple with respect to temperature gives ........

The deflection in a moving coil galvanometer falls from 50 divisions to 10 divisions,when a shunt of $ 2? $ is connected with it. The resistance of galvanometer coil is

Two electric bulbs are connected one by one across potential difference V. At that time power consumed in them are $P_1 \, and \, P_2 $ respectively. Now, if potential difference V is applied across series combination of these bulbs, what will be total power consumed ?

The internal resistance of a cell of emf 4 V is $ 0.1 \Omega $ It is connected to a resistance of $ 3.9 \Omega $. The voltage across the cell will be

The ratio of cross-sectional areas of two conducting wires made up of same material and having same length is 1 : 2. What will be the ratio of heat produced per second in the wires, when same current is flowing in them?

64 small drops of water having same charge and same radius are combined to form one big drop. The ratio of capacitance of big drop to small drop is

Write dimensional formula for the intensity of radiation

Resonance frequency of L-C-R series AC circuit is $f_0$ . Now the capacitance is made 4 times, then the new resonance frequency will become

n-type semiconductor is obtained on doping intrinsic germanium by

The limit of resolution of an optical instrument arises on account of

An electric dipole coincides on $Z$-axis and its midpoint is on origin of the coordinate system. The electric field at an axial point at a distance $z$ from origin is $E_{(z)}$ and electric field at an equatorial point at a distance y from origin is $ E_{( y)} $. Here $ z = y > a, \, so \, \bigg | \frac{ E_{ (z) }}{ E_{(y)}} \bigg | = $ ...

Currents of 10 A and 2 A are passed through two parallel wires A and B respectively in opposite directions. If the wire A is infinitely long and length of the wire B is 2 m, the force acting on the conductor B which is situated at 10 cm distance from A will be

An electric field is spread uniformly in Y-axis. Consider a point A as origin point. The co-ordinates of point Bare equal to (0, 2) m. The co-ordinates of point C are (2, 0) m. At points A, Band C, electric potentials are $ V_A \, V_B \, and \, V_C$ respectively. From the following options, which is correct ?

A voltmeter has resistance of G ohm and range of V volt.The resistance required in series to convert it into a voltmeter of range n V volt is

To increase the charge on the plate of a capacitor means to