The magnetic flux linked to a coil changes from 10 \(\times 10^{-3}\) Wb to 6 \(\times 10^{-3}\) Wb in 0.01 s. The induced emf will be :

Light from a point source in the air falls on a convex spherical glass surface having radius of curvature 20 cm and refractive index 1.5. The distance of the light source from the glass surface is 100 cm. The distance of the image from the glass surface is:

A circular loop is placed in the plane of the paper in a magnetic field B. A current is induced in the loop in an anticlockwise direction. This is because the magnetic field B is

A Wheatstone bridge has four resistors: R1= R2 = R3 = 1 \( \Omega \) and R4 = 2 \( \Omega \). In order to balance the bridge, resistor R4 has to be shunted by resistance of

Photoelectric current depends on
(A) the intensity of incident light
(B) the potential difference applied between the two electrodes
(C) the nature of the emitter material
(D) the conductivity of the emitter material
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Diameter of the objective lens of a telescope is 250 cm. For light of wavelength 600 nm, coming from a distant object, the limit of resolution of the telescope is close to :

The resistance of the platinum wire of a platinum resistance thermometer at the ice point is 10 \(\Omega\) and at steam point is 10.46 \(\Omega\). When the thermometer is inserted in a hot bath, the resistance of the platinum wire is 11.6 \(\Omega\). Calculate the temperature of the bath.

Choose the correct relation between drift velocity (\( v_d \)) and current density (\( J \)) from the following:

Observe the illustration and answer the following question:

Arrange the following in order of their occurance in human female ovary.
A. Formation of secondary follicle
B. Mitotic division of oogonia
C. Formation of mature Graafian follicle
D. Maintenance of corpus luteum
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Two coherent light beams of intensities I and 4 I are superimposed. The maximum and minimum possible intensities in the resulting pattern are :

The magnetic flux \(\Phi\), linked with a coil of resistance 5 \(\Omega\) varies with time as \(\Phi = (5t^2 - 4t + 1)\text{Wb}\). The current induced in the coil at 0.2 s is :

A compound is formed by two elements P and Q. The element Q forms ccp and atoms P occupy \(1/3^{rd}\) of tetrahedral voids. What is the formula of the compound ?

Benzene ring in phenol is expected to give the characteristic substitution or replacement reactions i.e. halogenation, nitration, sulphonation, alkylation etc. In these reactions, the attacking reagent is electrophile. The phenolic group activates the ortho and para positions in the ring due to conjugation. Disubstitution reactions are quite fast as the electron density in the ring has increased considerably. Phenols do not respond to nucleophilic substitution reactions as it is influenced by phenolic group.
Victor Meyer test gives following observations. Match List I with List II:

List-I	List-II
A. Blood red colouration	I. Tertiary alcohol
B. Blue colouration	II. Phenols
C. Colourless solution	III. Primary alcohol
D. Violet colouration with \(\text{FeCl}_3\)	IV. Secondary alcohol

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