Semiconductor Electronic: Material, Devices And Simple Circuits — Physics STD 12 Science — Question

The angle of dip at a place is 60°. At this place the total intensity of earth's magnetic field is 0.64 units. The horizontal intensity of earth's magnetic field at this place is(a) 1.28 units(b) 0.64 units(c) 0.16 units(d) 0.32 units

How many quantities are required to specify the magnetic field of the earth?

The activity of a radioactive sample is 1.6 curie and its half-life is 2.5 days. Its activity after 10 days will be(a) 0.8 curie(b) 0.4 curie(c) 0.1 curie(d) 0.16 curie

In a step-up transformer, the turn ratio is 1 : 2. A Leclanche cell (e.m.f. 1.5V) is connected across the primary. The voltage developed in the secondary would be(a) 3.0 V(b) 0.75 V(c) 1.5 V  (d) Zero

The ripple factor in a half wave rectifier is(a) 1.21(b) 0.48(c) 0.6(d) None of these

For a series LCR circuit the power loss at resonance is : -

Nature of electron beam travelling in same direction with same velocity is:

By placing the prism in minimum deviation position, images of the spectrum(a) Becomes inverted(b) Becomes broader(c) Becomes distinct(d) Becomes intensive

The nature of binding for a crystal with alternate and evenly spaced positive and negative ions is(a) Covalent(b) Metallic(c) Dipolar(d) Ionic