General Science Class 10

The property of a body to oppose the flow of electric charge through it is called electric :

1. Capacitance
2. Resistance
3. Potential
4. Conductance

Which statement is true about the magnetic poles?

1. Unlike poles repel
2. Like poles attract
3. Magnetic poles do not effect each other
4. A single magnetic pole does not exist

What is the direction of the magnetic field lines inside a bar magnet?

1. From north pole to south pole
2. South pole to north pole
3. From side to side
4. There are no magnetic field lines

The presence of a magnetic field can be detected by :

1. Small mass
2. Stationary positive charge
3. Stationary negative charge
4. Magnetic compass

If the current in a wire which is placed perpendicular to a magnetic field increases, the force on the wire :

1. Increases
2. Decreases
3. Remains the same
4. Will be zero

Which part of a D.C motor reverses the direction of current through the coil every half-cycle?

1. The armature
2. The commutator
3. The brushes
4. The slip rings

The direction of induced e.m.f. in a circuit is in accordance with conservation of :

1. Mass
2. Charge
3. Momentum
4. Energy

The step-up transformer :

1. Increases the input current
2. Increases the input voltage
3. Has more turns in the primary
4. Has less turns in the secondary coil

The turn ratios of a transformer is 10. It means :

1. Is = 10 Ip
2. Np - 10Ns
3. Ns = 10 Np
4. Vs = 10 Vp