A wire is stretched to increase its length by 4 times. The resistance of the wire will :

Identify the wrong nuclear equation :

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.
Choose the correct answer from the options given below:

The effect on the interference fringes in young double slit experiment if width of the slit is increased.
(A) The interference pattern gets less and less sharp
(B) The interference pattern gets brighter
(C) The interference pattern may disappear, if, condition \( s/S \le \lambda/d \) is not satisfied. (s is size of source and S is its distance from two slits)
(D) The interference fringes becomes broad
(E) No effect on the interference pattern
Choose the correct answer from the options given below :

Two point charges of \( 1 \times 10^{-6} \, C \) and \( 4 \times 10^{-6} \, C \) are placed at a certain distance away from each other. The resultant electric field intensity is zero at a distance of 15 cm from the charge \( 1 \times 10^{-6} \, C \). The distance between the two point charges will be :

Which of the following statements are correct ?
A. The saturation current is constant with collector plate potential for different frequencies of incident radiation.
B. The saturation current is different with collector plate potential for different frequencies of incident radiation.
C. The saturation current is different with collector plate potential for different intensity of incident radiation.
D. The saturation current is constant with collector plate potential for different intensity of incident radiation.
E. Below threshold frequency no photo electrons are emitted.
Choose the correct answer from the options given below :

Two slits are made 1 mm apart and the screen is placed 1 m away. What is the fringe width when a light used of wavelength 500 nm?

The reaction occurring at the cathode during discharging of a lead-storage battery is:

A and B invested ₹ 10,000 and ₹ ₹ 12,000 in a business two years ago. After 1 year their net loss was ₹ 880 . And during the 2 nd year their net profit was ₹ 2,530. So the presen

Arrange the following transition elements of the first series in increasing order of their densities
(A) Sc
(B) V
(C) Zn
(D) Cu
Choose the correct answer from the options given below :

Replacement of Cl of \(C _6 H _5 Cl\) to give \(C _6 H _5 OH\) occurs only in drastic conditions, but Cl of 2,4-dinitrochlorobenzene is readily replaced. This is because:

A galvanometer shows full scale deflection for a current of 4 mA. It is converted into an ammeter of range from 0 to 8
A by using a shunt. The ratio of resistance of the galvanometer coil to the resistance of the shunt used is nearly:

A network of resistors is connected as shown in the figure. The potential drop across 4\(\Omega\) resistors is