A boy in the topmost birth in a compartment of a train drops an apple aiming at the open hands of his birth while the train is just going to stop at the railway station. Where will the apple fall if the brother is sitting vertically below his hands at a distance of 2 meters?
1.The apple falls precisely on the hands of his brother
2.Slightly away from the hands of his brother in the direction opposite to the direction of the motion of the train
3. Slightly away from the hands of his brother in the direction of the motion of the train
4.None of the above
At what angle should the two force vectors 5N and 12 N be added to get a resultant vector of 13 N?
1.emf is produced
2.Torque is produced
3.Force is produced
4.Torque and force is produced
If the magnitude of the resultant force of two forces is lesser than the magnitude of the larger force, then
1.The two forces are perpendicular to each other
2.They two forces in opposite directions
3.The forces are different in magnitude and direction
4.The forces possess small magnitude
What is the torque acting on the bar magnet of moment M which is placed in a uniform field H making an angle of 300 with the field?
What is the voltage applied across the resonant circuit if the ac voltage across resistance R, inductance L and capacitance C is 5 V, 10 V and 10 V respectively?
What is the work done by the magnet of moment M if it is rotated through 3600 in magnetic field H?
1.He falls because of his habit of leaning forward
2. Due to inertia of motion, the upper body continues to be in motion in the forward direction but the feet comes to rest as soon as they touch the ground
3. Due to inertia of rest, the road is left behind and the man reaches forward
4.Due to all of the reasons stated above
1.The rider is suddenly afraid of falling
2.The lower body of the rider moves forward with the horse but the inertia of rest keep the upper body at rest
3.The rider is pushed backwards
4.None of the above options
A bird weighing 2 kg is locked inside a cage of mass 1 kg. If the bird starts flying what will be the weight of the bird and cage assembly?
A coil of diameter 0.2 cm is formed by a 6.28 m long wire and a current of 1 amp is passed in it. The magnetic induction at its centre will be
1.6.28 x 10-5 T
2.7.25 x 10-5 T
3.6.28 x 10-2 T
A force F acts between two charges +Q and -Q that is placed at a certain distance from each other. The third sphere of charge Q is placed between them. What is the magnitude and force experienced by the third charge?
1.3F in the direction of +Q charge
2.4F in the direction of +Q charge
3.8F in the direction of -Q charge
4.No direction and magnitude is zero
A long magnet is cut into two parts such that the ratio of their lengths is 2:1. What is the ratio pole strength of both the section?
A long wire carrying a steady current is bent into a circular loop of one turn. The magnetic field at the centre of the loop is B. It is then bent into a circular coil of n turns. The magnetic field at the centre of this coil of n turns will be
A person travels 10 km North and 20 km East. What will be the displacement from the initial point?
At a distance r, two equal charges are kept and they exert a force F on each other. What is the force acting on each charge, if the distance between them is doubled and charges are halved?
Electromagnetic waves are produced by
1.A static charge
2.An accelerated charge
3.A moving charge
1.Paramagnetic and Ferromagnetic materials
2.Paramagnetic Materials only
3.Ferromagnetic Materials only
In an electromagnetic wave in free space, the root mean square value of the electric field is 6 V/m. The peak value of the magnetic field is
1.2.83 x 10-8 T
2.1.51 x 10-8 T
3.0.80 x 10-8 T
4.4 x 10-8 T
In electromagnetic waves the phase difference between electric field vector and magnetic field vector is
1.The portion BC of the string breaks
2.The portion AB of the string breaks
3.None of the strings breaks
4.None of the above options
1.The lines have similar charges hence they repel each other
2.The lines always diverge from a single point
3.A point always has a single net magnetic field
4.The lines need magnetic lenses to intersect
1.If the point has a charge then the electric field is discontinuous at the point.
2.Continous electric field at a point
3.Continous electric field at a point if a charge is present at the point.
4.At the point, the electric field is discontinuous if a negative charge is present at the point.
1.It provides information about the direction of the electric field
2.Electric field lines provide information about the type of charge
3.Electric field lines provide information about the field strength
4.All the above
The magnetic field at a point x on the axis of a mall bar magnet is equal to the field at a point y on the equator of the same magnet. The ratio of the distances of x and y from the centre of the magnet is
The magnetism of a magnet is due to
3.due to pressure of big magnet inside the earth
4.spin motion of electrons
The ratio of the amplitude of the magnetic field to the amplitude of the electric field for electromagnetic wave propagation in a vacuum is equal to
2.Speed of light in vacuum
3.Reciprocal of the speed of light in vacuum
4.The ratio of magnetic permeability to electrical susceptibility in a vacuum.
The velocity of electromagnetic radiation in a medium of permittivity ε0 and permeability μ0 is given by
1.Undefined control sequence E
2.Undefined control sequence E
3./Undefined control sequence E
4.Undefined control sequence E
To which part of the spectrum does EM waves belong if the energy of the wave is of the order of 15 KeV.
3.Not a change
4.None of the above
1. 200 cycle/sec
What is the net force on the particle if it is simultaneously acted upon by two forces 4 N and 3 N?
4.Between 7 N and 1 N
What is the reciprocal of impedance?
What is the time taken by the alternating current of 50 Hz with an r.m.s value of 10 ampere to reach from zero to a maximum value and the peak value of current?
1.2 × 10-2 sec and 14.24 amp
2.5 × 10-3 sec and 8.07 amp
3.5 × 10-3 sec and 14.14 amp
4.1 × 10-2 sec and 7.07 amp
What will happen if a force is applied to a body moving with a constant speed along a straight line?
1.The speed increases
2.The direction changes
3.The momentum decreases
4.Continues to move with uniform velocity
When is Gauss law true?
1.the speed of light isn’t a universal constant
2.the inverse square law is false
3.magnetic monopoles are present
4.None of the above
1.Charge moving at a constant speed
4.An accelerating charge
1.Inertia is the property of a body by virtue of which the body is unable to change by itself the state of rest.
2. Inertia is the property of a body by virtue of which the body is able to change by itself the state of rest
3.Inertia is the property of a body by virtue of which the body is unable to change by itself the direction of motion
4.Inertia is the property of a body by virtue of which the body is unable to change by itself the state of rest and uniform linear motion
1. Magnetic field intensity is the number of lines of force crossing per unit volume.
2.Magnetic field intensity is the number of lines of force crossing per unit area.
3.Magnetic field intensity is the magnetic induction force acting on a unit magnetic pole.
4.Magnetic field intensity is the magnetic moment per unit volume.
1.Magnetic lines of force are always closed.
2.Magnetic lines of force always intersect each other.
3.Magnetic lines of force tend to crowd far away from the poles of the magnet
4.Magnetic lines of force do not pass through the vacuum.
1.The energy in an electromagnetic wave is divided equally between electric and magnetic vectors.
2.Both electric and magnetic field vectors are parallel to each other and perpendicular to the direction of propagation of the wave.
3.These waves do not require any material medium for propagation
4.Both electric and magnetic field vectors attain the maxima and minima at the same place and the same time
1.AC cannot pass through a DC ammeter
2.AC changes its direction
3.AC is virtual
4.The average value of a complete cycle is zero
Why do passengers in a moving train suddenly feel a jerk in the forward direction when the train stops abruptly?
1.The upper body of passengers continues to be in the state of motion while the lower part of the body which in contact with the seat remains at rest
2.The upper body of passengers continues to be in the state of motion while the lower part of the body which in contact with the seat remains at rest
3.The inertia of rest stops the train and takes the passengers forward
4.Nothing can be said due to insufficient data