1:48
The minimum wavelength x-rays produced by an electron accelerated through a potential difference of
MP Alam | Physics for JEE & NEET
2:19
A Carnot engine has an efficiency of 50% when its source is at a temperature 327°C. The temperature
2:56
A bullet is fired from a gun at the speed of 280 m s–1 in the direction 30° above the horizontal. Th
2:32
In a series LCR circuit, the inductance L is 10 mH, capacitance C is 1 F and resistance R is 100 .
3:06
Given below are two statements:Statement I: Photovoltaic devices can convert optical radiation into
3:11
Light travels a distance x in time t1 in air and 10x in time t2 in another denser medium. What is th
2:57
In hydrogen spectrum, the shortest wavelength in the Balmer series is . The shortest wavelength in
4:29
If the galvanometer G does not show any deflection in the circuit shown, the value of R is given by
3:00
The amount of energy required to form a soap bubble of radius 2 cm from a soap solution is nearly (s
1:04
The magnetic energy stored in an inductor of inductance 4 H carrying a current of 2 A is
2:40
A 12 V, 60 W lamp is connected to the secondary of a step-down transformer, whose primary is connect
3:25
An electric dipole is placed at an angle of 30° with an electric field of intensity 2 × 105 N C–1.
2:35
A vehicle travels half the distance with speed v and the remaining distance with speed 2v. Its avera
2:05
Let a wire be suspended from the ceiling (rigid support) and stretched by a weight W attached at its
4:16
If 0s E dS = over a surface, then(1) The number of flux lines entering the surface must be equal t
2:49
The work functions of Caesium (Cs), Potassium (K) and Sodium (Na) are 2.14 eV, 2.30 eV and 2.75 eVre
3:39
The temperature of a gas is –50°C. To what temperature the gas should be heated so that the rms spee
3:51
The ratio of frequencies of fundamental harmonic produced by an open pipe to that of closed pipe hav
5:15
Resistance of a carbon resistor determined from colour codes is (22000 ± 5%) . The colour of third
A metal wire has mass (0.4 ± 0.002) g, radius (0.3 ± 0.001) mm and length (5 ± 0.02) cm. The maximum
1:44
The equivalent capacitance of the system shown in the following circuit is
4:10
Two bodies of mass m and 9m are placed at a distance R. The gravitational potential on the line join
2:30
The venturi-meter works on(1) Huygen’s principle(2) Bernoulli’s principle(3) The principle of parall
2:18
The half life of a radioactive substance is 20 minutes. In how much time, the activity of substance
4:11
A football player is moving southward and suddenly turns eastward with the same speed to avoid an op
4:45
The errors in the measurement which arise due to unpredictable fluctuations in temperature and volta
4:54
The angular acceleration of a body, moving along the circumference of a circle, is(1) Along the radi
5:28
A full wave rectifier circuit consists of two p-n junction diodes, a centre-tapped transformer, capa
3:34
The ratio of radius of gyration of a solid sphere of mass M and radius R about its own axis to the r
4:22
The magnitude and direction of the current in the following circuit is
3:31
An ac source is connected to a capacitor C. Due to decrease in its operating frequency(1) Capacitive
The net magnetic flux through any closed surface is(1) Zero (2) Positive(3) Infinity (4) Negative
3:02
In a plane electromagnetic wave travelling in free space, the electric field component oscillates si
2:59
The potential energy of a long spring when stretched by 2 cm is U. If the spring is stretched by 8 c
A bullet from a gun is fired on a rectangular wooden block with velocity u. When bullet travels 24 c
4:33
A satellite is orbiting just above the surface of the earth with period T. If d is the density of th
6:47
The radius of inner most orbit of hydrogen atom is 5.3 × 10–11 m. What is the radius of third allowe
The net impedance of circuit (as shown in figure) will be
5:29
The x-t graph of a particle performing simple harmonic motion is shown in the figure. The accelerati
6:52
In the figure shown here, what is the equivalent focal length of the combination of lenses (Assume t
4:05
An electric dipole is placed as shown in the figure.
3:52
A horizontal bridge is built across a river. A student standing on the bridge throws a small ball ve
3:50
Calculate the maximum acceleration of a moving car so that a body lying on the floor of the car rema
3:13
10 resistors, each of resistance R are connected in series to a battery of emf E and negligible inte
3:41
For the following logic circuit, the truth table is
5:08
A very long conducting wire is bent in a semi-circular shape from A to B as shown in figure. The mag
1:33
The resistance of platinum wire at 0°C is 2 and 6.8 at 80°C. The temperature coefficient of resi
A wire carrying a current I along the positive x-axis has length L. It is kept in a magnetic fieldB
1:58
Two thin lenses are of same focal lengths (f), but one is convex and the other one is concave. When
