When the surface of a metal is illuminated with the light of wavelength 400 nm, the KE of the ejected photoelectrons is 1.68 eV. Then the work function of the metal is (hc = 1240 eV-nm) :

The force between the plates of a parallel plate capacitor of capacitance C, distance between plates d and potential difference V is:

A small signal voltage \(e=e_o\) sin wt is applied across an ideal capacitor of capacitance C. The correct statement is:

A bubble in glass slab (\( \mu = 1.5 \)) when viewed from one side appears at 5 cm and 2 cm from otherside, then the thickness of the glass slab is:

Using monochromatic light for diffraction in a single slit of width 0.1 mm, with a central maximum of 5 mm width on a screen 50 cm away, the wavelength of light used is :

Consider a permanent dipole of dipole moment P in a non-uniform electric field E. Which of the following option is correct?

All the hydrogen-like atoms in their ground states have the same

Which of the following element has highest binding energy per nucleon ?

The \(\alpha\) and \(\beta\) forms of glucose are known as

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 of the following technique is not very useful to detect the cancers of internal organs?

Basic hydrolysis of esters produces :

The equation of a plane passing through the points \((1,2,3),(4,2,3)\) and \((-1,0,6)\) is given by:

Which of the following argument supports the conservation of biodiversity
from the below statement:
"Waking up to a Bulbul's song in the morning"