If 'n' identical resistors, each of value 'R' are first connected in series to a battery of emf 'E' and internal resistance 'R', the current drawn is 'I'. Now if they are connected in parallel, then the current drawn is '5 I'. The value of n is

The energy equivalent of 5 g of substance is

Arrange the following steps \(( A , B , C\) and D \()\) in proper sequence to determine the index correction in the given arrangement.

(A) The difference between the two gives the correction to be applied to the observed distance.
(B) The positions of the uprights are read on the scale. Their difference gives the observed distance between tip of the pin and the pole of the mirror.
(C) A thin straight index needle OP is placed so that its one end O touches the tip of the pin and the other end P touches the pole of the mirror.
(D) Length of the needle OP is measured by placing it on the scale which is the actual distance between the points in question.
Choose the correct answer from the options given below:

An object approaches a convex lens from distance with a uniform speed of 3 m/s and stops at the focus. The image

In a Young's double-slit experiment, the slits are separated by 0.28 mm and the wavelength of light used is 6000 A. The fringes are observed on a screen placed 1.4 m away from the slits. The distance between the central bright fringe and the fourth bright fringe will be

Which of the following is NOT correct in the case of the output obtained from a full wave rectifier?

The transverse nature of light is shown by

If the standard electrode potential, \(E_{\text {cell }}^{\circ}=1.10 V\), then the \(E_{\text {cell }}\) for the following reaction at 298 K is
\(Zn ( s )+ Cu ^{2+}(0.1 M ) \rightarrow Zn ^{2+}(0.01 M )+ Cu ( s )\)

The electric field vector of a plane electromagnetic wave oscillates sinusoidally at a frequency of \(4.5 \times 10^{10} \text{ Hz}\) in a medium with permittivity \(\epsilon_0\) and permeability \(\mu_0\). The wavelength of the wave is

A dietician wishes to mix two types of food in such a way that the vitamin contents of the mixture contains atleast 8 units of Vitamin A and 10 units of Vitamin C. Food 'I' contains 2 units/kg of Vitamin A and 1 unit/kg of Vitamin C while food 'II' contains 1 unit/kg of Vitamin A and 2 units/kg of Vitamin C. It costs ₹5 per kg to purchase food I and ₹7 per kg to purchase food II. If 'x' kg of food I is mixed with 'y' kg of food II, then the constraint pertaining to vitamin C contents will be:

Choose the incorrect statement.

Different stages of oogenesis are given below. Arrange them in the sequence of their occurrence
A. Completion of first meiotic division of primary oocyte
B. Release of ovum from the ovary.
C. Primary oocyte in the primary follicle formation.
D. Graafian follicle

The percentage dissociation of 0.1 M AgI solution having a resistance of 100 \(\Omega\) in an electrolytic cell with cell constant 4 \(\text{cm}^{-1}\) is:
\(\lambda_{\text{m}}^{\circ}\) \(\left( AgNO _3\right)\) = 8000 \(\Omega^{-1}\text{cm}^2\text{mol}^{-1}\)
\(\lambda_{\text{m}}^{\circ}\) \(\left( KNO _3\right)\) = 10500 \(\Omega^{-1}\text{cm}^2\text{mol}^{-1}\)
\(\lambda_{\text{m}}^{\circ}\) (KI) = 9500 \(\Omega^{-1}\text{cm}^2\text{mol}^{-1}\)