A heater coil is rated 100 W, 200 V. It is cut into two identical parts. Both parts are connected together in parallel to the same source of 200 V. The energy liberated per second in the new combination is:

The number of photoelectrons emitted from a metal surface for incident light of frequency \(\nu\) (higher than the threshold frequency \(\nu_0\)) is directly proportional to :

In a photoelectric experiment, the wavelength of incident light is increased from \( 5 \times 10^{-10} \text{ m} \) to \( 9 \times 10^{-10} \text{ m} \), while the intensity of radiation remains the same. Choose the correct statement from the following.

A sample of radioactive nuclei has a half life of 5.5 years. The fraction of sample remaining undecayed after 22 years is

The constancy of the binding energy per nucleons in the range \( 30 < A < 170 \), where A is the mass number shows that :

Electromagnetic waves travel in a medium at a speed of \( 1.5 \times 10^8 \text{ m/s} \). The relative permeability of the medium is 0.4. The relative permittivity of the medium will be:

The average power associated with an ideal capacitor of capacitance \( 5 \ \mu\text{F} \) connected to an alternating emf \( E = 200 \sin 100\pi t \) is:

Which of the following shows the least value for standard enthalpy of atomization?

What is a one letter code of Tryptophan?

Match List-I with List-II

List-I (EM wave)	List-II (Production)
(A) Light	(I) Klystron valve or magnetron valve
(B) X-rays	(II) Rapid acceleration/deceleration of electrons in aerials
(C) Microwave	(III) Electrons in atoms move from higher to lower energy level
(D) Radiowave	(IV) Inner shell electrons/ fast-moving electrons decelerated by metal target

Choose the correct answer from the options given below:

To obtain a n-type silicon semiconductor, it must be doped with

Least basic compound among the following would be:

Read the following paragraph carefully and answer the given questions.
Certain types of leukocytes (WBC) of our body like polymorpho-nuclear leukocytes (PMNL-neutrophils) and monocytes and natural killer (type of lymphocytes) in the blood as well as macrophages in tissues can phagocytose and destroy microbes. For determining the cause of allergy, the patient is exposed to or injected with very small doses of possible allergens, and the reactions studied. The use of drugs like anti-histamine, adrenalin and steroids quickly reduce the symptoms of allergy. Heroin, commonly called smack is chemically diacetylmorphine which is a white, odourless, bitter crystalline compound. This is obtained by acetylation of morphine. 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. Different species of Plasmodium (P. vivax, P. malaria and P. falciparum) are responsible for different types of malaria. Of these, malignant malaria caused by Plasmodium falciparum is the most serious one and can even be fatal.
Which one of the following is not the cellular barrier of innate immunity?