NEET PHYSICS-QUESTION, ANSWER AND SOLUTION

QUESTION-1:

A screw gauge has a least count of 0.01 mm, there are 50 divisions in its circular scale, then the pitch of the screw is…………

• A)     0..01 mm
• B)     0.25mm
• C)     0.5 mm
• D)     1.0 mm

 ANSWER: (C)

SOLUTION:

Least count is the least value that can be measured by a screw gauge.

PITCH OF THE SCREW:

LEAST COUNT:

As per question the least count of the screw gauge is 0.01 mm, total number of divisions on its circular scale is 50

Pitch = Least count X total number of divisions in the circular scale

Pitch of the screw = 0.01 mm X 50

Pitch of the screw = 0.5 mm

QUESTION-2

A 40 micro-farad capacitor is connected to a 200 V, 50 Hz ac supply. The rms value of current in the supply is nearly,

• A)     1.7 A
• B)     2.05 A
• C)     2.5 A
• D)     25.1 A

ANSWER-(C)

SOLUTION:

CAPACITIVE REACTANCE:

Capacitive reactance of a capacitor Is the effective resistance offered by  the capacitor to the flow of current through it.

RMS VALUE OF CURRENT:

VARIATION OF CAPACITIVE REACTANCE WITH FREQUENCY:

GRAPHICAL REPRESENTATION: