10th Class Physics MCQS Chapter 6

The coil of a transformer which is connected to A.C is called:

Secondary coil

Field coil

Primary coil

Armature coil

Two uncharged objects a and b are rubbed against each other. When object b is placed near a negatively charged object c, the two objects repel each other. Which of these statements is true about object a:

Becomes negatively charged

Remains uncharged

Unpredictable

Becomes positively charged

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

N_s = 10 N_p

N_s = N_p

V_s =V_p /10

I_s = 10I_p

In C.R.O grid is always connected with potential:

Zero positive

Negative

High positive

Positive

The ray of light after reflection from concave mirror passes through

Centre

Radius

Principal focus

Pole

The angle at which prism deviates the incident ray is called:

Angle of reflection

Angle of deviation

Angle of incident

Angle of minimum deviation

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

Momentum

Mass

Energy

Charge

The presence of a magnetic field can be detected by a

Stationary negative charge

small mass

Magnetic compass

Stationary positive charge

The output of a NAND gate is 0 when:

Any of its inputs is 1

Both of its inputs are 0

Any of its inputs is 0

Both of its inputs are 1

The instrument which is used to display the magnitude of changing electric current is called:

Cathode rays oscilloscope

Evacuated tube

Picture tube

Television tube