CBSE 12 Chemistry Question Paper-2024 Set-3

An ammeter and a voltmeter are connected in series to a battery. Their readings are noted as 'A' and 'V' respectively. If a resistor is connected in parallel with the voltmeter, then

An ac voltage is applied across an ideal inductor. The current in it

An iron needle is kept near a strong bar magnet. It will experience

A galvanometer shows full scale deflection for a current I₉. If a shunt of resistance S₁ is connected to the galvanometer, it gets converted into an ammeter of range (0-I). When resistance of the shunt is made S₂ its range becomes (0-2I). Then (S₁/S₂) is

A coil of area of cross-section 0.5 m² is placed in a magnetic field acting normally to its plane. The field varies as B = 0.5t² + 2t where B is in tesla and t in seconds. The emf induced in the coil at t = 1s is

A pure Si crystal having 5 × 10²⁸ atoms m⁻³ is dopped with 1 ppm concentration of antimony. If the concentration of holes in the doped crystal is found to be 4.5 × 10⁹ m⁻³, the concentration (in m⁻³) of intrinsic charge carriers in Si crystal is about

The potential energy between two nucleons inside a nucleus is minimum at a distance of about

In a Young's double-slit experiment in air, the fringe width is found to be 0.44 mm. If the entire setup is immersed in water (n=4/3), the fringe width will be

The variation of the stopping potential (V₀) with the frequency (v) of the incident radiation for four metals A, B, C and D is shown in the figure. For the same frequency of incident radiation producing photo-electrons in all metals, the kinetic energy of photo-electrons will be maximum for metal

The energy of an electron in the ground state of hydrogen atom is -13.6 eV. The kinetic and potential energy of the electron in the first excited state will be

The electromagnetic waves used to purify water are

The focal lengths of the objective and the eyepiece of a compound microscope are 1 cm and 2 cm respectively. If the tube length of the microscope is 10 cm, the magnification obtained by the microscope for most suitable viewing by relaxed eye is :

Assertion (A): An α-particle is moving towards a gold nucleus. Reason (R): The impact parameter for scattering at an angle of 180° is maximum.

Assertion (A): In Young's double-slit experiment, when the two coherent sources are at an extremely small distance from each other, the interference pattern cannot be observed. Reason (R): The fringe width is proportional to the separation between the two sources.

Assertion (A): In photoelectric effect, the stopping potential increases with increase in intensity of incident light. Reason (R): The stopping potential is independent of the frequency of incident light.

Assertion (A): In forward biasing, the p-n junction diode offers very low resistance. Reason (R): The potential barrier of the p-n junction is decreased by a large amount in forward biasing.

A battery supplies 0.9 A current through a 2Ω resistor and 0.3 A current through a 7Ω resistor when connected one by one. The internal resistance of the battery is:

A particle of mass m and charge q describes a circular path of radius R in a magnetic field. If its mass and charge were 2 m and q/2 respectively, the radius of its path would be

Which of the following pairs is that of paramagnetic materials?

A galvanometer of resistance 50Ω is converted into a voltmeter of range (0-2V) using a resistor of 1.0 kΩ. If it is to be converted into a voltmeter of range (0-10 V), the resistance required will be

Two coils are placed near each other. When the current in one coil is changed at the rate of 5 A/s, an emf of 2 mV is induced in the other. The mutual inductance of the two coils is

A Young's double-slit experimental set up is kept in a medium of refractive index (4/3). Which maximum in this case will coincide with the 6th maximum obtained if the medium is replaced by air?

Which one of the following first row transition elements is expected to have the highest third ionization enthalpy?

Which of the following compounds will give a ketone on oxidation with chromic anhydride (CrO₃)?

Two among the three components of DNA are β-D-2-deoxyribose and a heterocyclic base. The third component is:

On association of an electrolyte in a solvent, the van't Hoff factor:

For the reaction X + 2Y → P, the differential form of the rate law is:

The most stable oxidation state of Iron is:

The product formed as a result of reaction of CH₃MgBr and CO₂ followed by hydrolysis is:

A nucleotide is composed of a:

Which of the following alkyl halides undergoes Sₙ1 reaction most readily?

Phenol forms a dimer in benzene with van't Hoff factor 0.54. Its degree of association is:

The equilibrium Cr₂O₇²⁻ ⇌ 2CrO₄²⁻: