IIT-JEE
Screening test(Physics)
Speedv Model Paper
Physics
Max Marks: 35 Time: 1 hour
1.Five balls numbered 1 to 5 are suspended using separate threads. Pairs (1,2), (2,4) and (4,1) show electrostatic attraction, while pairs (2,3) and (4,5) show
repulsion. Therefore ball 1 must be
a. Positively charged b. Negatively charged c. Neutral d. Made of Metal
2. A soap bubble is given a negative charge. Then its radius
a. Decreases b. Increases c. Remains unchanged d. Cannot be predicted
3. A stationary charge produces
a. An Electric field only b. A Magnetic field only c. Both Electric & Magnetic fields d. An Electromagnetic wave
4. A small metal ball is suspended in a uniform electric field with the help of an insulated thread. If high energy X-ray beam falls on it,
a. The ball will be deflected in the direction of the field b. The ball will be delected opposite to the direction of field
c. The ball will not deflect at all d. The ball will fly to infinity
5. The electric potential V at any point x,y,z (all coordinates in metre) in space is given by V=4x2 volt. The electric field at the point (1m, 0, 2m) in Volt/m
is
a. 8 along negative X axis b. 8 along positive X axis c. 16 along negative X axis d. 16 along positive X axis
6. In the network shown in the figure, each resistance is 1W. (Each side is a resistor).The effective resistance between A and B is
A B
a. 4/3 W b. 3/2 W c. 7W d. 8/7 W
7. A He nucleus makes a full rotation in a circle of radius 0.8 m in 2 sec. The value of the magnetic field B at the centre of the circle will be
a. 10-19/m b. 10-19 m c. 2 3 10-19 m d. 2 3 10-19 / m
8. A power line lies along east-west direction and carries a current of 10 ampere. The force per metre due to earth’s magnetic field of 10-4 Tesla is
a. 10-2 N b. 10-3 N c. 10-4 N d. 10-5 N
9. The magnetic field of a U shaped magnet is parallel to the surface of the paper, when the magnet is placed in the plane of paper with its north pole towards
left. A conductor is placed in the field, so that it is perpendicular to the paper. If the direction of flow of current current through the conductor is outwards,
it will tend to move
a. Downwards b. Upwards c. To the right d. To the left
10. Two parallel wires carrying current in the same direction attract each other because of
a. Potential difference between them b. Mutual inductance between them c. Electric forces between them d. Magnetic forces between
them