JEE Mains Physics 2002-2019 Solved Video Solutions
Planet A has mass M and radius R. Planet B has half the mass and half the radius of Planet A. If the escape velocities from the Planets A and B are VA and VB, respectively, then VA/VB = n/4. The value of n is :
23
Sep
Planet A has mass M and radius R. Planet B has half the mass and half the radius of Planet A. If the escape velocities from the Planets A and B are VA and VB, respectively, then VA/VB = n/4. The value of n is : Planet A has mass M and radius R. Planet [...]
In a fluorescent lamp choke (a small transformer) 100 V of reverse voltage is produced when the choke current changes uniformly from 0.25 A to 0 in a duration of 0.025 ms. The self-inductance of the choke (in mH) is estimated to be __________ .
23
Sep
In a fluorescent lamp choke (a small transformer) 100 V of reverse voltage is produced when the choke current changes uniformly from 0.25 A to 0 in a duration of 0.025 ms. The self-inductance of the choke (in mH) is estimated to be __________ . Which of the following gives a reversible operation? September 23, [...]
A rod of length L has non-uniform linear mass density given by ρ(x) = a + b(x/L)^2, where a and b are constants and 0 ≤ x ≤ L. The value of x for the centre of mass of the rod is at
23
Sep
A rod of length L has non-uniform linear mass density given by ρ(x) = a + b(x/L)^2, where a and b are constants and 0 ≤ x ≤ L. The value of x for the centre of mass of the rod is at A rod of length L has non-uniform linear mass density given by [...]
A body of mass m = 10 kg is attached to one end of a wire of length 0.3 m. The maximum angular speed (in rad s^–1) with which it can be rotated about its other end in space station is (Breaking stress of wire = 4.8 × 10^7 Nm^–2 and area of cross-section of the wire = 10^–2 cm^2) is:
23
Sep
A body of mass m = 10 kg is attached to one end of a wire of length 0.3 m. The maximum angular speed (in rad s^–1) with which it can be rotated about its other end in space station is (Breaking stress of wire = 4.8 × 10^7 Nm^–2 and area of cross-section of [...]
One end of a straight uniform 1m long bar is pivoted on horizontal table. It is released from rest when it makes an angle 30º from the horizontal (see figure). Its angular speed when it hits the table is given as √ns-1, where n is an integer. The value of n is __________ .
23
Sep
One end of a straight uniform 1m long bar is pivoted on horizontal table. It is released from rest when it makes an angle 30º from the horizontal (see figure). Its angular speed when it hits the table is given as √ns-1, where n is an integer. The value of n is __________ . Which [...]
The distance x covered by a particle in one dimensional motion varies with time t as x^2 = at^2 + 2bt + c. If the acceleration of the particle depends on x as x^–n, where n is an integer, the value of n is __________ .
23
Sep
The distance x covered by a particle in one dimensional motion varies with time t as x^2 = at^2 + 2bt + c. If the acceleration of the particle depends on x as x^–n, where n is an integer, the value of n is __________ . The distance x covered by a particle in one [...]
Both the diodes used in the circuit shown are assumed to be ideal and have negligible resistance when these are forward biased. Built in potential in each diode is 0.7 V. For the input voltages shown in the figure, the voltage (in Volts) at point A is __________ .
23
Sep
Both the diodes used in the circuit shown are assumed to be ideal and have negligible resistance when these are forward biased. Built in potential in each diode is 0.7 V. For the input voltages shown in the figure, the voltage (in Volts) at point A is __________ . Which of the following gives a [...]
A body A of mass m is moving in a circular orbit of radius R about a planet. Another body B of mass m/2 collides with A with a velocity which is half (vector v/2) the instantaneous velocity vector v of A. The collision is completely inelastic. Then, the combined body :
23
Sep
A body A of mass m is moving in a circular orbit of radius R about a planet. Another body B of mass m/2 collides with A with a velocity which is half (vector v/2) the instantaneous velocity vector v of A. The collision is completely inelastic. Then, the combined body : Which of the [...]
If the screw on a screw-gauge is given six rotations, it moves by 3 mm on the main scale. If there are 50 divisions on the circular scale the least count of the screw gauge is :
23
Sep
If the screw on a screw-gauge is given six rotations, it moves by 3 mm on the main scale. If there are 50 divisions on the circular scale the least count of the screw gauge is : If the screw on a screw-gauge is given six rotations it moves by 3 mm on the main [...]
A quantity f is given by f = √(hc5/G) where c is speed of light, G universal gravitational constant and h is the Planck’s constant. Dimension of f is that of :
23
Sep
A quantity f is given by f = √(hc5/G) where c is speed of light, G universal gravitational constant and h is the Planck’s constant. Dimension of f is that of : A quantity f is given by f = √(hc5/G) where c is speed of light G universal gravitational constant and h is the [...]