There are 15 MCQS.Give all of your answers in a single comment .Try to solve the test in 15-20 minutes.

(1) The angle subtended at the centre of sphere by an area of its surface is
A. 4/3 pi rad
B.  4 pi std
C. 4/3 pi std
D. 4 pi rad

(2) If 7.635 and 4.81 are two significant numbers then their difference in significant figures is
A. 2.825
B. 2.83
C. 2.82
D. 2.8

(3) The magnitude of the resultant of two forces is 2F.The magnitude of each force is F.The angle between the forces must be :
A. 0
B. 60
C. 45
D. 120

(4) The velocity of a boat is given by V= 3i + 4j.The magnitude of its velocity will be ___ units :
A. 3
B. 4
C. 5
D. 7

(5) A person throughs a ball vertically upwards in a train moving with constant acceleration.The ball will fall :
A. In his hand
B. behind him
C. in front of him
D. beside him

(6) A constant force changes the velocity of  an 80 kg body from 3ms-1 to 4ms-1 in 0.5s.The acceleration of the body is ____ ms-2
A. 1.5
B. 2.0
C. 2.5
D. 3.0

(7) The unit of angular momentum in system international is :
A. kg .m/s2
B. kg.m2/s
C. kg.m2/s2
D. kg.s/m2

(8) The energy stored in charged capacitor is given by :
A. 1/2 QV
B. 1/2 VC^2
C. 1/2 C^2V^2
D. 1/2 QV ^2

(9) Current (I) is flowing upward in a straight conductor,the magnetic field lines are ___.
A. parallel to the current
B. antiparallel to the current
C. clockwise around conductor
D. anticlockwise around the conductor

10) In CRO,the time base circuit is connected to the ____.
A. Y-Plates
B. X-Plates
C. Electron gun
D. Accelerating plates

(11) Which of the following will not generate emf ?
A. Holding a magnet stationary inside a coil
B. Rotating a coil in a magnetic field
C. Rotating a coil around a stationary coil
D. Moving a bar magnet across a flat piece of metal

(12) A sinusoidal current has RMS value of 10A.The peak value of current will be ___ A.
A. 20
B. 25
C. 11.14
D. None of these

(13) A NAND gate with inputs A and B have 0 output if
A. A=0
B. B=0
C. A=B=0
D. A=B=1

(14) The ratio of energies of electron of hydrogen atom in the first and second orbit is
A. 4
B. 9
C. 1/4
D. 1/9

(15) In pair production ,if the recoil particle is an electron then the maximum energy of photon for pair production must be ___ MeV.
A. 1.02
B. Less than 1.02
C. Greater than 1.02
D. 0.51 Mev


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