A monochromatic source emitting light of wavelength 600 nm has a power output of 66 W. The number of photons emitted by the source in 2 minutes is: (Given: \( h = 6.6 \times 10^{-34} \text{ Js} \))

Four equal charges \(Q\) are placed at the four corners of a square of side 'a'. Work done in removing a charge \(-Q\) from its centre to infinity is :

Monochromatic light is passed through a double slits, with separation between the slits, 0.5 mm and interference pattern is observed on a screen 2.5 m away. The first bright fringe is formed 2 mm away from central fringe. What is the wavelength of light?

Which of the following statements are correct?
A. The algebraic sum of potential drops around any closed loop is zero.
B. Metals have high resistivity.
C. The potentiometer is a device in which a condition of no current flow applies.
D. Kirchhoff's junction rule is based on conservation of charge.
E. Bending the wire changes the validity of Kirchhoff's junction rule.
Choose the correct answer from the options given below:

"In the nuclear reaction below, a neutron hits a uranium nucleus.
\( n + ^{235}_{92}\text{U} \rightarrow ^{a}_{54}\text{Xe} + ^{94}_{b}\text{Sr} + 2n \)
The values of a and b are respectively :

A galvanometer of resistance 520 \( \Omega \) is shunted with 20 \( \Omega \) resistance to convert it into an ammeter. The resistance of the ammeter will be

A heating element is marked \( V = 210 \text{ V, } P = 630 \text{ W} \). The resistance of the element (R) would be

The disease phenylketonuria is caused by mutation in the gene that codes for -

Read the passage carefully and answer the questions
Amines are considered as derivatives of ammonia obtained by replacement of hydrogen atoms with alkyl or aryl groups. In nature they occur among proteins, vitamins, alkaloids and hormones. These can be primary, secondary or tertiary depending on the number of hydrogen groups replaced. They can be prepared from nitro compounds, alkyl halides, nitriles, amides etc. Due to unshared pair of electrons they behave as Lewis bases. Influence of the number of hydrogen atoms at nitrogen atom is displayed in physical properties such as solubility, boiling point and chemical reactions including basicity. Basic character of amines is expressed in terms of their \(K_b\) and \(p K_b\) values. Three classes of amines can be distinguished with p-toluene sulphonyl chloride which reacts with primary and secondary ddu amines. Amino group when attached to benzene ring behaves as an activating and ortho para directing group.
Which amine will have highest \(p K _{ b }\) value?

Baculoviruses are pathogens that attack insects and other arthropods. These viruses belong to the genus:

An ac source has a frequency of 60 Hz. The time taken for the voltage to change from peak value to zero is :

Which one of the following codons performs a dual function?

The potential of a charged spherical conductor of radius r is 20V. The potential at a point r/4 from its center is: