List of practice Questions

Pick up the wrongly matched pair.
In cockroach, principal motor centre is
At constant pressure, if the work done by a gas is 40% of the increase in the internal energy of the gas, then the specific heat capacity of the gas at constant volume is
(Universal gas constant \(R = 8.3 \, \text{J mol}^{-1} \text{K}^{-1}\))
1.84 g of a mixture of CaCO\(_3\) and MgCO\(_3\) is strongly heated to get a residue of 0.96 g. The percentage of CaCO\(_3\) in the mixture is

Which of the following statements are correct regarding lithium and magnesium? 
I) They react slowly with water 
II) Their bicarbonates are solids 
III) Their chlorides are not soluble in ethanol 
IV) Their nitrates decompose easily on heating 
 

When a metal surface is irradiated with light of frequency \( \nu \) Hz, the kinetic energy of emitted photoelectrons is \( x \) J. When the same metal is irradiated with light of frequency \( y \) Hz, the kinetic energy of emitted electrons is \(\frac{z}{3}\) J. What is the threshold frequency (in Hz) of the metal?

A part of a circuit is shown in the figure. The ratio of the potential differences between the points A and C, and the points D and E is.

 

The magnetic moment of an electron moving in a circular orbit of radius R with a time period T is
Consider the following:
Statement-I: If thermal energy is stronger than intermolecular forces, the substance prefers to be in gaseous state.
Statement-II: At constant temperature, the density of an ideal gas is proportional to its pressure.
The correct answer is
The device used for voltage regulation is
The preferred reagent for the preparation of pure alkyl chloride from alcohol is
A thin circular ring and a circular disc of equal mass are rolling without sliding. If their linear velocities are equal and the total kinetic energy of the disc is 6 J, then the total kinetic energy of the ring is:
The force between two conducting spheres of same radius having charges +8 μC and -4 μC separated by some distance in air is F. If the spheres are connected by a conducting wire and after some time the wire is removed, then the magnitude of the force between the two conducting spheres is
The IUPAC name of the complex shown below is:
K₃[Co(COₓ)₃]
Which of the following is not an antibiotic?
The number of amphoteric oxides from the following is
\(\mathrm{CO_2, GeO_2, SnO_2, PbO_2, CO, GeO, SnO, PbO}\)
Which of the following statements is not correct?
The sequence of reagents required to convert aniline to benzoic acid is:
(a) Write the full form of BOD.
(b) Define BOD. Explain how it is a measure of the organic matter present in the water body.
What is the acceleration of a body of mass 4 kg when a force of 20 N is applied to it?
What is the distance between the points $(3, -2)$ and $(-1, 4)$?
What is the IUPAC name of the compound \( \text{CH}_3\text{CH}_2\text{COCH}_2\text{CH}_3 \)?

What are X and Y respectively, in the following set of reactions? 

A metal crystallizes with hcp packing. The total number of voids, total number of tetrahedral voids and total number of octahedral voids are shown as A, B and C respectively. A, B and C in 0.25 moles of metal are respectively ($N_A$ = Avogadro number).
The minimum force required to stop a body of mass 4 kg moving along a straight line with a velocity of 54 kmph in a distance of 9 m is