In Young's double slits experiment, the fringe width is found to be 0.2 mm for air medium. If the whole apparatus is immersed in water of refractive index 4/3 the new fringe width will be:

A circular loop of area \(1 cm^2\), carrying a current of 10 A , is placed in a magnetic field of 0.1 T perpendicular to the plane of the loop. The torque on the loop due to the magnetic field is :

Displacement current (\( i_{d} \)) = \( \epsilon_{0} \frac{d\phi_{E}}{dt} \)
Where symbols have their usual meanings.
Which of the following options gives correct equation for displacement current ?

A hot electric iron has resistance of \( 88 \, \Omega \) and is used with a 220 V source. The electrical energy consumed in 4 h is:

Monochromatic lights of wavelengths 620 nm and 626 nm, respectively are used to study diffraction at a single slit of aperture 0.7 mm. The distance between the slit and the screen is 1.8 m. The separation between the positions of the first maxima of the diffraction pattern obtained in the two cases is

When a capacitor is subjected to a D.C. source it takes small time internal to get fully charged up. During this small time interval there is no passage of charge through dielectric, yet we use a term - displacement current. This term is used because :

Seven lead accumulators, each of emf 2 V, and internal resistance \( 0.07 \text{ } \Omega \), are connected in series with an external resistance \( 9.51 \text{ } \Omega \). The current in the circuit is

The product obtained from catalytic reduction of propanal is:

Select the statements which hold true for immune system:
A. Innate immunity or nonspecific immunity is present at the time of birth.
B. Acquired immunity is never pathogen specific
C. Cytokine barriers are a part of innate immunity
D. Rheumatoid arthritis is an auto-immune disease
Choose the correct answer from the options given below:

Read the following passage carefully and answer the given questions.
Immune System in the Body
The human immune system consists of lymphoid organs, tissues, cells and soluble molecules like antibodies. The primary lymphoid organs are bone marrow and thymus where immature lymphocytes differentiate into antigen-sensitive lymphocytes. After maturation the lymphocytes migrate to secondary lymphoid organs like spleen, lymph nodes, tonsils, Peyer's patches of small intestine and appendix. The secondary lymphoid organs provide the sites for interaction of lymphocytes with the antigen, which then proliferate to become effector cells. The bone marrow is the main lymphoid organ where all blood cells including lymphocytes are produced. Each antibody molecule has four peptide chains, two small called light chains and two longer called heavy chains. Hence, an antibody is represented as H2L2. Different types of antibodies are produced in our body. IgA, IgM, IgE, IgG are some of them. Techniques like radiography (use of X-rays), CT (computed tomography) and MRI (magnetic resonance imaging) are very useful to detect cancers of the internal organs.
The site of interaction of lymphocytes with antigen is

Match List - I with List - II.

List - I	List - II
(A) Leydig Cell	(I) GnRH
(B) Hypothalamus	(II) Androgens
(C) Growing follicle	(III) Progesterone
(D) Corpus luteum	(IV) Estrogen

Choose the correct answer from the options given below:

Arrange the following plants as per the correct order of their evolution.
(A). Psilophyton
(B). Tracheophyte ancestors
(C). Rhynia-type plants
(D). Chlorophyte ancestors
Choose the correct answer from the options given below:

Match List I with List II

List - I (Disease)	List - II (Causal organism)
(A) Pneumonia	(I) Protozoan
(B) Common cold	(II) Roundworm
(C) Malaria	(III) Bacteria
(D) Ascariasis	(IV) Virus

Choose the correct answer from the options given below: