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

Which of the following statement is wrong(a) Infrared photon has more energy than the photon of visible light(b) Photographic plates are sensitive to ultraviolet  rays(c) Photographic plates can be made sensitive to infrared rays(d) Infrared rays are invisible but can cast shadows like visible light rays

State which of the following is correct(a) Joule = coulomb × volt(b)  Joule = coulomb/volt(c) Joule = volt × ampere(d) Joule = volt/ampere

Two bulbs, one of 50 watt and another of 25 watt are connected in series to the mains. The ratio of the currents through them is(a) 2 : 1(b) 1 : 2(c) 1 : 1(d) Without voltage, cannot be calculated

When light is incident on a doubly refracting crystal, two refracted rays-ordinary ray (O-ray) and extra ordinary ray (E-ray) are produced. Then(a) Both O-ray and E-ray are polarised perpendicular to the plane of incidence(b) Both O-ray and E-ray are polarised in the plane of incidence(c) E-ray is polarised perpendicular to the plane of incidence and O-ray in the plane of incidence(d) E-ray is polarised in the plane of incidence and O-ray perpendicular to the plane of incidence

A capacitor with air as the dielectric is charged to a potential of  100 volts. If the space between the plates is now filled with a dielectric of dielectric constant 10, the potential difference between the plates will be(a) 1000  volts (b) 100 volts (c) 10 volts(d) Zero

The shortest wavelength in Balmer’s series for Hydrogen atom is ...A... and this is obtained by substituting ...B ... in Balmer’s formula. Here, A and B refer to?

Assertion :  A red object appears dark in the yellow light
Reason     : A red colour is scattered less (a) If both assertion and reason are true and the reason is the correct explanation of the assertion.(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.(c) If assertion is true but reason is false.(d) If the assertion and reason both are false.