The function of the soft iron core in the moving coil galvanometer is:

For a short electric dipole, identify the incorrect statement(s).
(A) The electric field intensity varies inversely with the cube of the distance from the center of the dipole.
(B) The electric field is directed from negative to positive charge.
(C) The electric potential at mid-point of the dipole is zero.
(D) The electric field intensity at mid-point of the dipole is zero.
Choose the correct answer from the option given below :

A parallel combination of three resistors takes a current of 7.5 A from a 30 V battery.
If the resistances of two resistors are \( 12 \text{ } \Omega \) and \( 10 \text{ } \Omega \), then the resistance of the third resistor is:

The refractive indices of glass and water are 3/2 and 4/3, respectively. If light passes from glass to water, the critical angle is

The current sensitivity of a moving coil galvanometer can be increased by
A. Decreasing the magnetic field
B. Increasing the number of turns
C. Increasing the area of the coil
D. Inserting a soft iron core in the coil
E. Decreasing the area of the coil
Choose the correct answer from the options given below:

An electric dipole with dipole moment \( 3 \times 10^{-9} \, \text{C m} \) is aligned at \( 30^\circ \) with the direction of uniform electric field of magnitude \( 6 \times 10^4 \, \text{N C}^{-1} \). What will be the magnitude of torque?

A student is asked to observe his face in three different types of mirrors P, Q, R one by one by holding each mirror close to his face at same distance. Mirror P given exact and same size image, Q gives exact but smaller while R gives exact but larger image.
A. P is Convex mirror, Q is Plane, R is Concave
B. P is Plane, Q is Convex, R is Concave
C. P is Concave, Q is Plane, R is Convex
D. P is Convex, Q is Concave, R is Plane
Choose the correct answer from the options given below:

The drift velocity of electrons in a copper wire of length 2 m under the application of a potential difference of 200 V is \( 0.5 \text{ ms}^{-1} \). The mobility of electrons in \( \text{m}^2\text{V}^{-1}\text{s}^{-1} \) is :

A card from a pack of 52 cards is lost. From the remaining cards of the pack, two cards are drawn and are found to be heart. Then the probability of the missing card to be a heart is:

Alcohol is a depressant, which means that even small amounts of alcohol slow down the actions of parts of the brain, so alcohol lengthens the time you take to respond to a stimulus.
Different people react differently to alcohol. In some people, it increase their feelings of aggression, and releases their inhibitions so that they are more likely to be violent or commit other crimes.
An alcoholic needs to drink quite large quantities of alcohol regularly. This causes many parts of the body to be damaged, because alcohol is poisonous to cells. Probably, there are many factors which decide whether or not a person becomes alcoholic. Over a long period of time, it can cause loss of memory and confusion. One way in which the damage is done is that alcohol in the body fluids draws water out of cells by osmosis.
Identify the measure which is not useful for prevention and control of alcohol abuse among adolescents.

Identify the set of cells which have haploid number of chromosomes ?

If \(x\) is in the 1 st Quadrant, then the value of \(\tan ^{-1}\left(\frac{\sqrt{1+\cos x}+\sqrt{1-\cos x}}{\sqrt{1+\cos x}-\sqrt{1-\cos x}}\right)\) is :

Choose the incorrect statements from the following :
(A) The dipole moment of cyclohexyl chloride is smaller than chlorobenzene.
(B) Alkyl halides are immiscible with water.
(C) The dipole moment of methyl chloride is higher than that of methyl fluoride.
(D) Chloroform doesn't undergo aerial oxidation in the presence of light
Choose the correct answer from the options given below :