An ac source of variable angular frequency and constant amplitude is connected in series with a capacitance C and an electric bulb of resistance R. When angular frequency is increased then :

In an a.c. circuit, a resistor, a capacitor and an inductor are connected in series, in which \( X_C = X_L = R \). The impedance of this circuit will be

The wavelength of Red light in the visible region is about 760 nm. The energy of photon in that case will be :

Two cells with internal resistances \( r_1 \) and \( r_2 \) are connected across the load resistance R as shown in the figure. The values of \( r_1, r_2 \) and R are (1/2) \( \Omega \), (1/3) \( \Omega \) and (9/5) \( \Omega \), respectively. The current through R is:

The distance between a luminous object and the screen is 60 cm. A convex lens placed in between produces a three times magnified image on the screen. The focal length of the convex lens is:

The magnetic flux ( \(\Phi\) ) is:

'n' identical small drops are charged to V volt each. They coalesce to form a bigger drop. The potential of the bigger drop will be:

Match List-I with List-II

List-I  (Type of solution)	List-II  (Examples)
(A) Gas in liquid	(I) Brass
(B) liquid in liquid	(II) Benzene in Toluene
(C) liquid in solid	(III) Aerated drinks
(D) solid in solid	(IV) Mercury in gold

Choose the correct answer from the options given below:

Read the passage and answer the following
Microbes are organisms that cannot be seen with the naked eye. They include bacteria, archaea, protists, viruses, prions, and fungi. They account for most of the diversity of life on earth. Far more microbes inhabit a single person's body than there are people on the entire planet. Microbes also dominate in terms of their ability to live and thrive in extreme environments, including clouds, deep-sea volcanoes, springs, ice caps, and animal intestines. Most animals, including humans, exhibit numerous associations with microbes. Our "human microbiome" includes our skin, hair, mouth, and gut.
Select the chemical substances which are produced by some microbes and they can kill or prevent growth of other microbes :

In some plants, the ovary develops into fruit without fertilization. This phenomenon is called:

Match List-I and List-II.

List-I	List-II
(A) Adenine	(I) Purine
(B) Thymine	(II) Pyrimidine
(C) Uracil	(III) RNA
(D) Deoxyribose	(IV) DNA

Choose the correct answer from the options given below :

Arrange the stages of embryo development in a dicot plant.
(A) Heart shaped embryo
(B) Globular embryo
(C) Zygote
(D) Mature embryo
Choose the correct answer from the options given below:

The minimum energy required to excite a Hydrogen atom from its ground state is :