Question Paper (Section wise)

The half – life of a radioactive substance is 30 minutes. The time (in minutes) taken between 40% decay and 85 % decay of the same radioactive substance is

Two identically balls A and B having velocities of 0.5 m/s and -0.3 m/s respectively collide elastically in one dimension. The velocities of B and A  after the collision respectively will be

Two identical bodies are made of a material for which the heat capacity increase with temperature. One of these is at 100°C, while the other one is at 0°C. if the two bodies are brought into contact, then, assuming no heat loss, the final common temperature is

A parallel – plate capacitor of area A, plate separation d and capacitance C is file with four dielectric materials having dielectric constants k₁, k₂, k₃ and k₄ as shown in the figure below. If a single dielectric material is to be used to have the same capacitance C in the capacitor. Then its dielectric constant k is given by

A 100 ? resistance and a capacitor of 100 ? reactance are connected in series across a 220 V source. When the capacitor is 50% charged, the peak value of the displacement current is

Given van der Waals constant for NH₃, H₂, O₂ and CO₂ are respectively 4.17, 0.244, 1.36 and 3.59, which one of the following gases in most easily liquefied?

The correct order of atomic radii in group 13 elements is:

The bond dissociation energies of X₂, Y₂ and XY are in the ratio of 1:0.5:1. ?H for the formation of XY is -200 kJ mol^-1. The bond dissociation energy of X₂ will be:

In which case is the number of molecules of water maximum?

Which oxide of nitrogen is not a common pollutant introduced into the atmosphere both due to natural and human activity?

Coconut fruit is a:

Adult human RBCs are enucleate. Which of following statement(s) provide the most appropriate explanation for this feature?

       i.            They do not need to reproduce.

     ii.            They are somatic cells.

   iii.            They do not metabolise.

   iv.            All their internal space is available for oxygen transport.

The water potential of pure water is:

Which of the following options gives the correct sequence of events during mitosis?

Which among these is the correct combination of aquatic mammals?

Fruit and leaf drop at early stages can be prevented by the application of:

During DNA replication, Okazaki fragments are used to elongate:

Which of the following RNAs should be most abundant in an animal cell?

Out of ‘X’ pairs of ribs in humans only ' Y' pairs are true ribs. Select the option that correctly represents values of X and Y and provides their explanation:

In case of poriferans, the spongocoel is lined with flagellated cells called: