By increasing the temperature, the specific resistance of a conductor and a semiconductor

In a Young's double slit experiment, interference fringes were produced on a screen placed 1.8 m from the two slits 0.3 mm apart and illuminated by light of wavelength 600 nm. The fringe width is

A light ray is incident normal to one face of a right-angled isosceles prism and is totally internally reflected at the glass-air interface. If the angle of reflection is \(\frac{π}{4}\), what can be concluded about the refractive index?

The impurity atoms with which pure silicon may be doped to make it a p-type semiconductor are those of
A. Phosphorous
B. Boron
C. Antimony
D. Aluminum
E. Graphite
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In free space, all components of the complete electromagnetic spectrum have the same

Identify the correct statements in the following:
(A) Optical fibres consist of a core and cladding
(B) Optical fibres are fabricated such that light reflected at one side of the inner surface strikes the other at an angle smaller than the critical angle.
(C) Optical fibres make use of the phenomenon of total internal reflection.
(D) Optical fibres can be used as an optical pipe
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If an electron and a photon have energy, then,
(A) Electrons and photons both have wavelengths
(B) Electron and photon both have momentum
(C) Both electron and photon do not have momenta
(D) The electron has energy and momentum and the photon has energy only
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Match List-l with List-II

List-l (Complex)	List-II (Property)
(A) \(\left[ CoF _6\right]^{3-}\)	(I) \(d^5\), high spin
(B) \(\left[ Fe ( CN )_6\right]^{4-}\)	(II) \(d^6\), high spin
(C) \(\left[ FeF _6\right]^{3-}\)	(III) \(d^5\), low spin
(D) \(\left[ Mn ( CO )_6\right]^{2+}\)	(IV) \(d^6\), low spin

Choose the correct answer from the options given below :

Answer the question on the basis of passage given below :
Adsorption is a surface phenomenon and it differs from absorption which occurs throughout the body of the substance that absorbs. In physiosorption the attractive forces are mainly van der Waal's forces while in chemisorption ionic/covalent bonds are formed between particles of adsorbent and adsorbate. The catalytic activity of finely divided iron in Haber's process of ammonia manufacture can be explained by adsorption theory. Adsorption being an exothermic process, the heat of adsorption is utilised in enhancing the rate of the reaction. Adsorption has many applications being used in gas masks, control of humidity, chromatograph separation, curing diseases etc.
Which of the following is not correct regarding the adsorption of a gas on the surface of solid ?
(A) On increasing temperature, adsorption increases continuously.
(B) Enthalphy and entropy changes are negative.
(C) Chemical adsorption is more specific than physical adsorption.
(D) High temperature favours physical adsorption.
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Choose the correct statements from the following:
(A) Electromagnetic waves do not follow the principle of superposition.
(B)The variations in the electric field and in the magnetic field of electromagnetic waves, if any, never happen simultaneously.
(C) Electromagnetic waves are produced by accelerated charges
(D) The energy of electromagnetic waves is divided equally into electric and magnetic field vectors.
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Consider the following hypothesis \(H_0: \mu=315\) and \(H_a: \mu \neq 315\).
A sample of 60 provided a sample mean of 324.6 . The standard deviation ( \(\sigma\) ) is 14 and level of significance \(\alpha=0.05\). Then the confidence interval is :
[Given : \(Z_{\alpha / 2} \frac{14}{\sqrt{60}}=3.54\)]

Match List - I with List - II.

List - I	List - II
(A) Entamoeba histolytica	(I) Filariasis
(B) Wuchereria bancrofti	(II) Malaria
(C) Microsporum	(III) Amoebiasis
(D) Plasmodium falciparum	(IV) Ringworm

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Two polaroid \( P_1 \) and \( P_3 \) are placed such that their pass-axis are mutually perpendicular. Another polaroid \( P_2 \) is rotated between \( P_1 \) and \( P_3 \). For what angle \( \theta \) between \( P_1 \) and \( P_2 \) the intensity of light emerging from \( P_3 \) will be maximum ?