Discussion 
Topic 

Fri July 25, 2014
hii
By
Khushi Ray
(1)

Entrance Exam 

Tue July 08, 2014
pcm
Solar spectrum is an example for
(A) line emission spectrum
(B) continuous emission spectrum
(C) band absorption spectrum
(D) line absorption spectrum
By
Tanvi Maheshwari
(1)

Entrance Exam 

Tue July 08, 2014
pcm
Pick out the correct statement from the following :
(A) pu239 is not suitable for a fission reaction.
(B) For stable nucleus, the specific binding energy is low.
(C) Energy released per unit mass of the reactant is less in case of fusion reaction.
(D) Packing fraction may be positive or may be negative
By
Tanvi Maheshwari
(1)

Entrance Exam 

Tue July 08, 2014
pcm
Magnetic field at the centre of a circular coil of radius R due to current I flowing through it is B. The magnetic Held at a point along the axis at distance R from the centre is ______.
(A)
(B)
(C)
(D)
By
Tanvi Maheshwari
(1)

Entrance Exam 

Tue July 08, 2014
pcm
Maximum diffraction takes place in a given slit for
(A) g rays
(B) ultraviolet light
(C) infrared light
(D) radio waves
By
Tanvi Maheshwari
(1)

Entrance Exam 

Tue July 08, 2014
pcm
A car is moving with a speed of 30 m/s on a circular path of radius 500 m. Its speed is increasing at the rate of 2 m/s2. The acceleration of the car is
(a) 9.8 m/s2
(b) 1.8 m/2
(c) 2 m/s2
(d) 2.7 m/s2
By
Tanvi Maheshwari
(0)

Entrance Exam 

Tue July 08, 2014
pcm
A car is moving on a circular path and takes a turn. If R1 and R2 are the reactions on the inner and outer wheels respectively, then
(a) R1 = R2
(b) R1 < R2
(c) R1 > R2
(d) R1 ³ R2
By
Tanvi Maheshwari
(1)

Entrance Exam 

Tue July 08, 2014
pcm
A body of mass m is suspended from a string of length l. What is the minimum horizontal velocity that should be given to the body in its lowest position so that it may complete full revolution in the vertical plane with the point of suspension at the center of circle?
(a)
(b)
(c)
(d)
By
Tanvi Maheshwari
(1)

Entrance Exam 

Tue July 08, 2014
pcm
A body is moving along a circular path with variable speed. It has
(a) a radial acceleration
(b) a tangential acceleration
(c) zero acceleration
(d) both tangential and radial accelerations
By
Tanvi Maheshwari
(1)

Entrance Exam 

Tue July 08, 2014
pcm
ln which of the processes, does the internal energy of the system remain constant?
(A) Adiabatic
(B) Isochoric
(C) Isobaric
(D) Isothermal
By
Tanvi Maheshwari
(1)

Entrance Exam 

Tue July 08, 2014
pcm
A car is moving in a circular track of radius 10 metre with a constant speed of 10 m/sec. A plumb bob is suspended from the roof of the car by a light rigid rod of 1 metre long. The angle made by the rod with the track is
(a) zero
(b) 30°
(c) 45°
(d) 60°
By
Tanvi Maheshwari
(1)

Entrance Exam 

Tue July 08, 2014
pcm
A car has a linear velocity v on a circular track of radius r. If its speed is increasing at a rate of a m/s2, then its resultant acceleration will be
(a)
(b)
(c)
(d)
By
Tanvi Maheshwari
(1)

Entrance Exam 

Tue July 08, 2014
pcm
A can filled with water is revolved in a vertical circle of radius 4 metre and the water does not fall down. The time period of revolution will be
(a) 1 sec
(b) 10 sec
(c) 8 sec
(d) 4 sec
By
Tanvi Maheshwari
(1)

Entrance Exam 

Tue July 08, 2014
pcm
A bucket tied at the end of a 1.6 m long string is whirled in a vertical circle with a constant speed. What should be the minimum speed so that the water from the bucket does not spill when the bucket is at the highest position?
(a) 4 m/sec.
(b) 6.25 m/sec.
(c) 16 m/sec.
(d) None of these
By
Tanvi Maheshwari
(1)

Entrance Exam 

Tue July 08, 2014
pcm
A bucket containing water is tied to one end of a rope of length 2.5 m and rotated about the other end in a vertical circle. What should be the minimum velocity of the bucket at the highest point, so that the water in the bucket will not spill? (g = 10 m/s2)
(a) 2.5 m/s
(b) 4 m/s
(c) 5 m/s
(d) 7 m/s
By
Tanvi Maheshwari
(1)

Entrance Exam 

Tue July 08, 2014
pcm
A body of mass m performing UCM with frequency n along the circumference of circle having radius r, force is given by
(a) 4pnm2
(b) 4p2n2m
(c) p2n2mr
(d) pnm2
By
Tanvi Maheshwari
(1)

Entrance Exam 

Tue July 08, 2014
pcm
A body of mass 100 gram, tied at the end of a string of length 3 m rotates in a vertical circle and is just able to complete the circle. If the tension in the string at its lowest point is 3.7 N, then its angular velocity will be ______ (g = 10 m/s2)
(a) 4 rad/s
(b) 3 rad/s
(c) 2 rad/s
(d) 1 rad/s
By
Tanvi Maheshwari
(1)

Entrance Exam 

Tue July 08, 2014
pcm
A body of mass 100 gram, tied at the end of a string of length 3 m rotates in a vertical circle and is just able to complete the circle. If the tension in the string at its lowest point is 3.7 N, then its angular velocity will be ______ (g = 10 m/s2)
(a) 4 rad/s
(b) 3 rad/s
(c) 2 rad/s
(d) 1 rad/s
By
Tanvi Maheshwari
(1)

Entrance Exam 

Tue July 08, 2014
pcm
A body is traveling in a circle at constant speed. It
(a) has constant velocity.
(b) has no acceleration
(c) has an inward acceleration
(d) has an outward radial acceleration
By
Tanvi Maheshwari
(1)

Entrance Exam 

Tue July 08, 2014
pcm
A body is moving along a circular path with variable speed. It has
(a) a radial acceleration
(b) a tangential acceleration
(c) zero acceleration
(d) both tangential and radial accelerations
By
Tanvi Maheshwari
(1)

Entrance Exam 

Tue July 08, 2014
pcm
A body is allowed to slide on a frictional less track from rest undergravity. The track ends in a circular loop of diameter D. What should be the minimum height of the body in terms of D, so that it may successfully complete the loop?
(a) D
(b) D
(c) D
(d) 2D
By
Tanvi Maheshwari
(1)

Entrance Exam 

Tue July 08, 2014
pcm
Which of the following is most general charachteristic of Magnetic field
The magnetic field exerts a force F⃗ on any other moving charge or current that is present in the field.
The magnetic field exerts a force {/tex}\vec{F}{/tex} on any other particle
The magnetic field exerts a force F⃗ only on any magnets present in the field.
The magnetic field exerts a force F⃗ only on any iron filings
Clear
By
Tanvi Maheshwari
(1)

Entrance Exam 

Tue July 08, 2014
pcm
A wire is perpendicular to the plane of the paper. A ring of compass needles surrounds the wire in the plane of the paper with center of ring being the center of the wire .Initially there is no current in the wire. What happens after a steady dc current is established in the wire?
The needles become parallel to each other
The needles become tangential to the ring of which they are a part
some needles become parallel to each other while others are uneffected
nothing happens
By
Tanvi Maheshwari
(1)

Entrance Exam 

Tue July 08, 2014
pcm
lf a black body emits 0.5 joules of energy per second when it is at 27°C , then the amount of energy emitted by it when it is at 627°C will be
(A) 40.5 J
(B) 162 J
(C) 13.5 J
(D) 135 J
By
Tanvi Maheshwari
(1)

Entrance Exam 

Tue July 08, 2014
pcm
n Young's double slit experiment, a third slit is made in between the double slits. Then
(A) intensity of fringes totally disappears.
(B) only bright light is observed on the screen.
(C) fringes of unequal width are formed.
(D) contrast between bright and dark fringes is reduced.
By
Tanvi Maheshwari
(1)

Entrance Exam 
