Dual Nature of Radiation and Matter — Physics STD 12 Science — Question

The intensity distribution of X-rays from two coolidge tubes operated on different voltages V₁ and V₂ and using different target materials of atomic numbers Z₁ and Z₂ is shown in the figure. Which one of the following inequalities is true?

(a) V1 > V2, Z1 < Z2

(b) V1 > V2, Z1 > Z2

(c) V1 < V2, Z1 > Z2

(d) V1 = V2, Z1 < Z2

If a conductor has a potential V ≠ 0 and there are no charges anywhere else outside, then:

The equivalent resistance of the arrangement of resistances shown in adjoining figure between the points A and B is

(a) 6 ohm

(b) 8 ohm

(c) 16 ohm

(d) 24 ohm

The time required to pass the light through a glass slab of 2 mm thick is ()

(a)

(b)

(c)

(d)

Which one of the following is feebly repelled by a magnet?

A 25 watt, 220 volt bulb and a 100 watt, 220 volt bulb are connected in series across a 220 volt lines. Which electric bulb will glow more brightly

(a) 25 watt bulb	(b) 100 watt bulb
(c) First 25 watt and then 100 watt	(d) Both with same brightness

Which one of the following is similar between electrostatic force and gravitational force?

A beam of light AO is incident on a glass slab (μ = 1.54)  in a direction as shown in figure. The reflected ray OB is passed through a Nicol prism on viewing through a Nicole prism, we find on rotating the prism that

(a) The intensity is reduced down to zero and remains zero

(b) The intensity reduces down some what and rises again

(c) There is no change in intensity

(d) The intensity gradually reduces to zero and then again increases

A cell of negligible resistance and e.m.f. 2 volts is connected to series combination of 2, 3 and 5 ohm. The potential difference in volts between the terminals of 3 ohm resistance will be

(a) 0.6

(b) 2/3

(c) 3

(d) 6

Out of dia, para and ferromagnetism, the universal property of all substances is: