Electric Charges and Fields — Physics STD 12 Science — Question

A logic gate is an electronic circuit which

(a) Makes logic decisions

(b) Allows electrons flow only in one direction

(c) Works binary algebra

(d) Alternates between 0 and 1 values

As the mass number A increases, which of the following quantities related to a nucleus do not change?

If a charged particle at rest experiences no electromagnetic force:

A thermo couple uses Bismuth and Tellurium as the dissimilar metals. The sensitivity of bismuth is -72μV/℃  and that of the tellurium is 500μV/℃. If the difference between hot and cold junction is 100℃  then the maximum output will be

(a) 50 mV

(b) 7.2 mV

(c) 42.8 mV

(d) 57.2 mV

In case of NPN-transistors the collector current is always less than the emitter current because

(a) Collector side is reverse biased and emitter side is forward biased

(b) After electrons are lost in the base and only remaining ones reach the collector

(c) Collector side is forward biased and emitter side is reverse biased

(d) Collector being reverse biased attracts less electrons

Visible light passing through a circular hole forms a diffraction disc of radius 0.1mm on a screen. If an X-ray is passed through the same setup, the radius of the diffraction disc will be:

1. zero
2. < 0.1mm
3. 0.1mm
4. > 0.1m

Find the wrong statement.

If in Rutherford’s experiment, the number of particles scattered at 90° angle are 28 per min, then number of scattered particles at an angle 60°  and 120°  will be

(a) 112/min, 12.5/min

(b) 100/min, 200/min

(c) 50/min, 12.5/min

(d) 117/min, 25/min