10^-3 W of 5000 Å light is directed on a photoelectric cell. If the current in the cell is 0.16 mA, the percentage of incident photons which produce photoelectrons, is

Let n_r and n_b be respectively the number of photons emitted by a red bulb and a blue bulb of equal power in a given time.

The maximum kinetic energy of photoelectrons emitted from a surface when photons of energy 6 eV fall on it is 4eV. The stopping potential is Volts is

If the frequency of light in a photoelectric experiment is doubled, the stopping potential will

The stopping potential for the photo electrons emitted from a metal surface of work function 1.7eV is 10.4 V. Identify the energy levels corresponding to the transitions in hydrogen atom which will result in emission of wavelength equal to that of incident radiation for the above photoelectric effect

A point source of light is used in photoelectric effect. If the source is removed farther from the emitting metal, the stopping potential

Radiation of two photon energies twice and five times the work function of metal are incident sucessively on the metal surface. The ratio of the maximum velocity of photoelectrons emitted is the two cases will be

A point source causes photoelectric effect from a small metal plate. Which of the following curves may represent the saturation photocurrent as a function of the distance between the source and the metal?

When a photon of light collides with a metal surface, number of electrons, (if any) coming out is

Cut off potentials for a metal in photoelectric effect for light of wavelength l₁, l₂ and l₃ is found to be V₁, V₂ and V₃ volts if V₁, V₂ and V₃ are in Arithmetic Progression and l₁, l₂ and l₃ will be

The energy released by the fission of one uranium atom is 200 MeV. The number of fissions required per second to produce 3.2 W of power is

If in a nuclear fission, a piece of uranium of mass 0.5 g is lost, then the energy obtained in kWh is

What is the rest mass energy of an electron?

Which of the following are not emitted by a radioactive substance?

During a negative beta decay,

The half-life of Pa-218 is 3 minutes. What mass of a 16 g sample of Pa-218 will remain after 15 minutes?

Mp denotes the mass of a proton and Mn that of a neutron. A given nucleus of binding energy B contains Z protons and N neutrons. The mass M (N, Z) of the nucleus is given by

The circuit shown in the figure contains two diodes D₁ and D₂, each with a forward resistance of 50 ohms and infinite backward resistance. If the battery voltage is 6 V, the current (in amperes) through the 100 ohm resistance is

I is the current passing through a circular wire. If the radius of the wire is changed to twice, then what will be the current passing through the wire?

To obtain a p-type semiconductor germanium crystal, it must be doped with foreign atoms whose valency is

A monochromatic light is incident on a hydrogen sample in ground state. Hydrogen atoms absorb a fraction of light and subsequently emit radiation of six different wavelengths. The frequency of incident light is x × 10¹⁵ Hz. The value of x is ____________.

(Given h = 4.25 × 10^-15 eVs)

The stopping potential for photoelectrons emitted from a surface illuminated by light of wavelength 6630  is 0.42 V. If the threshold frequency is x × 10¹³ /s, where x is _________ (nearest integer).

(Given, speed light = 3 × 10⁸ m/s, Planck's constant = 6.63 × 10⁻³⁴ Js)

When light of frequency twice the threshold frequency is incident on the metal plate, the maximum velocity of emitted electron is v₁. When the frequency of incident radiation is increased to five times the threshold value, the maximum velocity of emitted electron becomes v₂. If v₂ = x v₁, the value of x will be __________.

A nucleus disintegrates into two nuclear parts, in such a way that ratio of their nuclear sizes is 1: 2^1/3 Their respective speed have a ratio of n : 1. The value of n is __________.

A nucleus with mass number 242 and binding energy per nucleon as 7.6 Me V breaks into two fragment each with mass number 121. If each fragment nucleus has binding energy per nucleon as 8.1 MeV, the total gain in binding energy is _________MeV.

Choose the correct statement regarding the physical properties of carbonyl compound.

Ozonolysis of an organic compound gives formaldehyde as one of the products. This confirms the presence of:

The correct order of increasing acidic strength is:

Presence of unsaturation in organic compounds can be tested with:

Which of the following will not undergo aldol condensation?

Which of the following gives benzoic acid on oxidation?

Toluene reacts with halogen in presence of iron(III) chloride giving ortho and para halo compounds, the reaction is?

Which of the following carboxylic acid is highly insoluble in water?

What is the name of the above reaction?

Acetic acid is obtained when which of the given reaction takes place?

What is the name of the following compound?

CH₃CH₂COCI

Identify the product for the following reaction.

CH ≡ CH + HOCI →

Which of the following names is correct for

Propanal on treatment with dilute sodium hydroxide gives:

Which of the following organic compounds does not undergo diazotisation?

The coupling of diazonium salt of 4-amino benzene sulphonic acid with N, N-dimethyl benzamine produces

Which among the following statements is incorrect?

Which of the following compounds give carbylamine reaction?

Which of the following indicates open chain structure of glucose?

The numbers of stereo centres present in linear and cyclic structures of glucose are respectively:

A solution of phenol in chloroform when treated with aqueous NaOH gives compound P as a major product. The mass percentage of carbon in P is ______. (to the nearest integer) (Atomic mass: C = 12; H = 1; O = 16)

How many of the transformations given below would result in aromatic amines?

The number of sp³ hybridised carbons in an acyclic neutral compound with molecular formula C₄H₅N is ___________.

The mass of NH₃ produced when 131.8 kg of cyclohexanecarbaldehyde undergoes Tollen's test is ________ kg. (Nearest Integer)

Molar Mass of
C = 12g/mol
N = 14g/mol
O = 16g/mol

Number of isomeric compounds with molecular formula C₉H₁₀O which (i) do not dissolve in NaOH (ii) do not dissolve in HCI. (iii) do not give orange precipitate with 2,4-DNP (iv) on hydrogenation give identical compound with molecular formula C₉H₁₂O is __________.