Practice Set 1
The recoil speed of a hydrogen atom after it emits a photon in going from n = 5 state to n = 1 state will be :-
26
Sep
The recoil speed of a hydrogen atom after it emits a photon in going from n = 5 state to n = 1 state will be :- The recoil speed of a hydrogen atom after it emits a photon in going from n = 5 state to n = 1 state will be :- September [...]
Given below are two statements : Statement I : An electric dipole is placed at the centre of a hollow sphere. The flux of electric field through the sphere is zero but the electric field is not zero anywhere in the sphere. Statement II : If R is the radius of a solid metallic sphere and Q be the total charge on it. The electric field at any point on the spherical surface of radius r (< R) is zero but the electric flux passing through this closed spherical surface of radius r is not zero. In the light of the above statements, choose the correct answer from the options given below:
26
Sep
Given below are two statements : Statement I : An electric dipole is placed at the centre of a hollow sphere. The flux of electric field through the sphere is zero but the electric field is not zero anywhere in the sphere. Statement II : If R is the radius of a solid metallic sphere [...]
Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : For a simple microscope the angular size of the object equals the angular size of the image. Reason R : Magnification is achieved as the small object can be kept much closer to the eye than 25 cm and hence it subtends a large angle. In the light of the above statements choose the most appropriate answer from the options given below :
26
Sep
Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : For a simple microscope the angular size of the object equals the angular size of the image. Reason R : Magnification is achieved as the small object can be kept much closer [...]
The internal energy (U), pressure (P) and volume (V) of an ideal gas are related as U = 3PV + 4. The gas is :
26
Sep
The internal energy (U), pressure (P) and volume (V) of an ideal gas are related as U = 3PV + 4. The gas is : pressure (P) and volume (V) of an ideal gas are related as U = 3PV + 4. The gas is : The internal energy (U) September 26, 2021 Category: JEE [...]
A cord is wound round the circumference of wheel of radius r. the axis of the wheel is horizontal and moment of inertia about it is I A weight mg is attached to the end of the cord and falls from the rest. After falling through the distance h. the angular velocity of the wheel will be….
26
Sep
A cord is wound round the circumference of wheel of radius r. the axis of the wheel is horizontal and moment of inertia about it is I A weight mg is attached to the end of the cord and falls from the rest. After falling through the distance h. the angular velocity of the wheel [...]
The trajectory of a projectile in a vertical plane is y=αx−βx^2 where α and β are constants and x and y are respectively the horizontal and vertical distances of the projectile from the point of projection. The angle of projection theta and the maximum height attended H are respectively given by:
26
Sep
The trajectory of a projectile in a vertical plane is y=αx−βx^2 where α and β are constants and x and y are respectively the horizontal and vertical distances of the projectile from the point of projection. The angle of projection theta and the maximum height attended H are respectively given by: The logic circuit shown [...]
A particle executes S.H.M., the graph of velocity as a function of displacement is :
26
Sep
A particle executes S.H.M., the graph of velocity as a function of displacement is : A particle executes S.H.M. the graph of velocity as a function of displacement is : September 26, 2021 Category: JEE Mains Physics 2002-2019 Solved Video Solutions , Practice Set 1 ,
A tuning fork A of unknown frequency produces 5 beats/s with a fork of known frequency 340 Hz. When fork A is filed, the beat frequency decreases to 2 beats/s. What is the frequency of fork A ?
26
Sep
A tuning fork A of unknown frequency produces 5 beats/s with a fork of known frequency 340 Hz. When fork A is filed, the beat frequency decreases to 2 beats/s. What is the frequency of fork A ? A tuning fork A of unknown frequency produces 5 beats/s with a fork of known frequency 340 [...]
An aeroplane, with its wings spread 10 m, is flying at a speed of 180 km/h in a horizontal direction. The total intensity of earth’s field at that part is 2.5 × 10^–4 Wb/m^2 and the angle of dip is 60°. The emf induced between the tips of the plane wings will be :-
26
Sep
An aeroplane, with its wings spread 10 m, is flying at a speed of 180 km/h in a horizontal direction. The total intensity of earth’s field at that part is 2.5 × 10^–4 Wb/m^2 and the angle of dip is 60°. The emf induced between the tips of the plane wings will be :- An [...]
The length of a metal wire is l1 when the tension in it is T1. It is l2 when the tension is T2. The original length of the wire is
26
Sep
The length of a metal wire is l1 when the tension in it is T1. It is l2 when the tension is T2. The original length of the wire is The length of a metal wire is l1 when the tension in it is T1. It is l2 when the tension is T2. The original [...]