The magnifying power of a telescope is 6 in normal adjustment. The distance between its two lenses is 35 cm. The focal lengths of objective and eye-piece are, respectively:

The impurity atoms with which pure silicon may be doped to make it a p-type semiconductor are those of
A. Phosphorous
B. Boron
C. Antimony
D. Aluminum
E. Graphite
Choose the correct answer from the options given below:

A long straight wire carries a current of 12 A. Another straight wire of length 5 cm placed parallel to it at a distance of 5 cm, carries a current of 2 A. The magnetic force on the smaller wire is

The output voltage of an ideal transformer connected to 240 V a.c. mains is 24 V. When this transformer is used to light a bulb with ratings 24 V, 24 W, the primary current would be-

The graphs of stopping potential versus frequency of incident radiation for two metals A and B are given.
Identify the correct statement(s) from the following:

(A) The slope of the graphs is equal to the Planck's constant.
(B) Intercept on the (-y) axis is equal to (work function/e).
(C) Threshold frequency for metal A is higher than metal B.
(D) Work function for metal B is greater than metal A.
Choose the correct answer from the options given below:

If the wave length of 1st line of Balmer series of hydrogen is 6561A, the wavelength of the 2nd line of series will be:

Two point charges + 200 \( \mu \)C are placed at a distance of 2 mm from each other in a uniform electric field of \( 10^5 \text{ N/C} \), such that the line joining the negative to positive charge makes an angle 30° with the field. The torque acting on the system is:

Read the passage carefully and answer the questions given along
Our immune system plays the major role in preventing diseases when we are exposed to disease-causing agents. Immunity is of two types: (i) Innate immunity and (ii) Acquired immunity. The human immune system consists of lymphoid organs, tissues, cells and soluble molecules like antibodies. The immune system also plays an important role in allergic reactions, auto-immune diseases and organ transplantation. The primary lymphoid organs are bone marrow and thymus. The secondary lymphoid organs are spleen, lymph nodes, tonsils, Peyer's patches of small intestine and appendix. There is lymphoid tissue also located within the lining of the major tracts (respiratory, digestive and urogenital tracts) called mucosa associated lymphoid tissue (MALT). It is important to note that HIV/AIDS is not spread by mere touch or physical contact; it spreads only through body fluids. AIDS has no cure, prevention is the best option. Adolescence is accompanied by several biological and behavioural changes and surveys and statistics show that use of drugs and alcohol has been on the rise especially among the youth. Factors associated with drug and alcohol abuse among adolescents are a child's natural curiosity, stress, the perception among youth that it is 'cool' or progressive to smoke, media exposure and an unstable or unsupportive family structures and peer pressure. It is best to identify the situations that may push an adolescent towards use of drugs or alcohol, and to take remedial measures well in time.
Find the incorrect statement about human health and disease.

Which of the following statements is INCORRECT?

Transfer of pollen grains from anther of a flower to the stigma of a flower on different plant is called as _________

If \(A=\left[\begin{array}{ccc}0 & 0 & \sqrt{3} \\ 0 & \sqrt{3} & 0 \\ \sqrt{3} & 0 & 0\end{array}\right]\), then \(|\operatorname{adj} A|\) is equal to:

In an ecosystem, energy flow is:

Match List-I with List-II

List-I (Matrix Product)	List-II (Order of resultant matrix)
(A) \(\left[a_{i j}\right]_{2 \times 3} \times\left[b_{i j}\right]_{3 \times 4}\)	(I) \(2 \times 4\)
(B) \(\left[a_{i j}\right]_{2 \times 1} \times\left[b_{i j}\right]_{1 \times 3}\)	(II) Not possible
(C) \(\left[a_{i j}\right]_{3 \times 2} \times\left[b_{i j}\right]_{3 \times 2}\)	(III) \(3 \times 3\)
(D) \(\left[a_{i j}\right]_{3 \times 3} \times\left[b_{i j}\right]_{3 \times 3}\)	(IV) \(2 \times 3\)

Choose the correct answer from the options given below :