The solid cylinder and a hollow cylinder, both of the same mass and same external diameter are released from the same height at the same time on a inclinded plane. Both roll down without slipping which one will reach the bottom first?
Both together only when angle of inclination of plane is 45o
Both together
Hollow cylinder
Hollow cylinder
A particle of mass M starting from rest undergoes uniform acceleration. If the speed acquired in time T is v, the power delivered to the particle is
Mv2/T
Mv2 / 2T2
Mv2/T2
Mv2/T2
A monatomic gas at pressure p1 and V1 is compressed adiabatically to 1/8 th its original volume. What is the final pressure of the gas?
64 p1
p1
16 p1
16 p1
A particle having a mass of 10-2 kg carries a charge of 5 x 10-8 C. The particle is given an initial horizontal velocity of 105 ms-1 in the presence of electric field and magnetic field. To keep the particle moving in a horizontal direction. it is necessary that
1) should be perpendicular to the direction of velocity and should be along the direction of velocity
2) Both and should be along the direction of velocity.
3) Both and are mutually perpendicular and perpendicular to the direction of velocity
4) should be along the direction of velocity and should be perpendicular to the direction of velocity.
(1) and (3)
(3) and (4)
(2) and (3)
(2) and (3)
A condenser of capacity C is charged to a potential difference of V1. The plates to the condenser are then connected to an ideal inductor of inductance L. The current through the inductor when the potential difference across the condenser reduces to V2 is
The thermal emf E in volt of a certain thermocouple is found to vary with temperature difference θ in oC between the two junctions according to the relation
The neutral temperature for the thermocouple will be
450o C
400o C
225o C
225o C
The magnetic moment of a diamagnetic atom is
much greater than one
one
equal to zero
equal to zero
Two identical bar magnets are fixed with their centres at a distance d apart. A stationary charge Q is placed at P in between the gap of the two magnets at a distance D from the centre O as shown in the figure.
The force on the charge Q is
zero
directed along OP
directed along PO
directed along PO
A.
zero
The force of attraction on Q by the north pole of the first magnet is F. The force of attraction on the same charge by n the north pole of another magnet must be opposite to that of the first magent. Thus, they concel the effect of one other and hence force on the charge Q is zero.
A current loop consists of two identical semicircular parts each of radius R, one lying in the x-y plane and the other in x-z plane. if the current in the loop is i. The resultant magnetic field due to the two semicircular parts at their common centre is
Two parallel metal plates having charges +Q and -Q faces each other at a certain distance between them. If the plates are now dipped in kerosene oil tank, the electric field between the plates will
become zero
increase
decrease
decrease