Level 3 Challenge

An angiospermic plant has 24 chromosomes in microspore mother cell. The number of chromosomes in its endosperm will be

Restriction endonucleases are most widely used in recombinant DNA technology. They are obtained from

The type of placentation in which ovary is syncarpus unilocular and ovules on sutures is called

In a cardiac output of 5250 ml per minute, with 75 heartbeats per minute, the stroke volume is

Which of the following plant hormones reduces transpiration rate by inducing stomatal closure?

Fertilized ovum in humans is transplated in the uterus, how many days after fertilization

If decomposers on the earth are totally extinct, the most secure effect would be that

Non elastic but flexible tissue which serves to attach the muscles with the bone is

Which of the following blood group is a universal recipient in blood transfusion?

The epithelial lining of the alveoli of the frog’s lungs facing lung cavity is

Energy transfers or transformations are never 100% efficient. This is due to

The equipment employed for sterilizing glass and culture media is known as

The cohesive force existing between molecules of water is contributing to

UV-B radiation from sun causes which of the following disorder of eyes?

Which of the following structures helps in the respiration of lichens?

The endocrine gland of insects, which secretes the juvenile hormone is

The drug useful to increase cardiovascular effects in human beings is

Which of the following will be useful in artifical ripening of fruits

Which pigment is essential for nitrogen fixation by leguminous plants

A vertebra has a convexity both in front and behind it. It is called

The primary acceptor, during carbon dioxide fixation in C₃ plants is

Which of the following fruits are found in the family ranunculaceae?

Which enzyme is used as ‘molecular scissor’ in genetic engineering?

How many cytochromes are involved in the electron transport chain?

The temperature range, at which enzymes are maximum functional is

When a potato piece is kept in a concentrated salt solution then

Which one of the following is the first national park in India?

In genetic engineering experiment, DNA fragments are joined by

Frequency of Down’s syndrome increase when the maternal age is

Which of the following is necessary to start clotting of blood

The population dynamics of a species is basically regulated by

Net gain of ATP from one glucose molecule during glycolysis is

Which of the cranial nerve of man is both sensory and motor?

In the members of family malvaceae, anthers are described as

In a vertebrate which germ layer froms the skeletal muscles

The cell division that takes place in a zygote is known as

Addition or deletion of one or few chromosomes results in

The abiogenisis occurred about how many billion years ago

The smallest known agents of the infectious disease are

Which of the following sugar is found in nucleic acid?

Which of the following induces cell division in a cell

Protein present in the matrix of cartilage is known as

The slime moulds are characterised by the presence of

Delivery of developed foetus is scientifically called

Development of fruit without fertilization is called

Which of the following is biodegradable pollutant?

In phylum protozoa, the class of total parasite is

Interauricular septum in the embryonic stages has

Growth movements, in response to light are called

The restriction endonuclease is used for cutting

Yeast belongs to which of the following classes

Ribosomes are involved in protein synthesis in

Which is always present in photochemical smog?

From where most of antibiotics are extracted?

Double fertilization is the characteristic of

Drones in a colony of honey bee originate by

First organism to evolve on the earth were

Number of chromosome in Down’s syndrome is

Acquiring an oxygen debt is evidence that

Respiratory quotient is less than one for

Sewage pollution is not responsible for

Muscles which are immune to fatigue are

To get haploid callus, one can culture

Photophosphorylation was discovered by

Which of the following causes plague?

Baterial photosynthesis does not show

Pattern of cleavage in frog’s egg is

Crop rotation is used by farmers to

The oxygen toxicity is related with

A dicot plant lacking cotyledons is

Which enzyme joins DNA fragments?

Yellow colour of faeces is due to

Binomial nomenclature indicates

Most fossils have been found in

Succus entericus is also called

Photorespiration takes place in

Energy enters ecosystem through

Athletes generally suffer from

The water of green coconut is

Nervous conduct impulses by

Mesozoic era is the era of

Pure line breed refers to

Dengue is transmitted by

Bones become fragile in

Deforestation causes

Osmosis is a type of

Calyptra is seen in

Nif gene occurs in

Glycolysis is

DDT is

An organic compound A(C₄H₉Cl) on reaction with Na/diethylether gives a hydrocarbon,which on monochlorination gives only one chloro derivative.A is

An aqueous solution of sodium sulphate is electrolysed using inert electrodes.The products at the cathode and anode are respectively

During the crystallization of a solid from the aqueous solution, the following statement is correct (∆H is -ve)

The hydrogen ion concentration in mol/dm, in a 0.2 M solution of a weak acid HA (Ka = 2 x 10⁻⁵) is close to

Amino acids,Which build up proteins, have both the carboxylic and amino groups. These amino acids are

The two polypeptide chains present in insulin contain which of the following number of amino acids

When river water meets sea water delta formation takes place. This is due to the phenomenon of

The coordination number of an atom in the simple cubic unit cell in a crystal lattice is

Aqueous solution of Cu (II) gives an intense blue solution with ammonia,which is due to

When a strong beam of light is passed through a colloidal solution, the light will

The volume of water to be added to N/2 HCl to prepare 500 cm³ of N/10 solution is

The number of water molecules in gypsum and in plaster of paris are respectively

During the electrolysis of H₂O, volume of H₂ and O₂ are released in the ratio

Amongest the following,the compound that can most readily get sulphonated is

The ionic radii of isoelectronic species N³⁻, O²⁻ and F⁻ are in the order

In a cubic cell,the contribution of an atom at a face of the unit cell is

If 1,3-dibromopropane reacts with Zinc and Nal ,the product obtained is

Tertiary butyl alcohol gives tertiary butyl chloride on treatment with

Peroxide effect can be checked by the addition of sufficient amount of

The ratio of area covered by second orbital to the first orbital is

Which of the following isomeric alcohols react fastest with HCL

Which metal will displace copper from copper sulphate solution

Acetamide and ethylamine can be distinguished by reacting with

Which of the following is expected to form colourless complex

The bond formed due to sidewise overlapping of π-orbitals is

Which of the following compound gives Cannizzaro’s reaction

The beilstein test for organic compounds is used to detect

Translational kinetic energy for 2 moles of gas at 27°C is

The number of valence electrons in 4.2g of N³⁻ ion is

Which of the following aqueous acid is most acidic

A drug that is antipyretic as well as analgesic is

Which of the following is a strong reducing agent

A neutral fertilizer among these compounds is

Photochemical smog is due to the presence of

DDT is prepared by reacting chlorobenzen with

The oxidation state of nitrogen is highest in

The compressibility factor of an ideal gas is

Which of the following has sp²-hybridisation

Magnetic moment of (NH₄)₂[MnBr₄] is ___ BM

Sodium Hydroxide reacts with Zinc to form

Which would exhibit ionisation isomerism

The ion that is isoelectronic with CO is

Which of the following is a basic dye

Cannizzaro reaction is not given by

The C-C bond length is longest in

In the Young’s double slit experiment, a point P on the central bright fringe is such that intensity of point P is 1/4 times the maximum intensity, distance between the slits is d and wavelength λ. Then angular separation of point P is

A particle moves along a circle of radius 20/π m with constant tangential acceleration. If the velocity of the particle is 80m/s at the end of the second revolution after motion has begun, the tangential acceleration is

A concave mirror ia placed over a beaker containing water of (µ = 1.33) and image of the object placed at the bottom of beaker is formed at a distance of 25 cm from the top, then focal length of the mirror is

Two coils of self inductance 2 mH and 8 mH are placed so close together that the effective flux in one coil is completely linked with the other. The mutual inductance between these coils is

A light emitting diode(LED) has a voltage drop of 2 volt across it and passes a current of 10 mA when it operates with a 6 volt battery through a limiting resistor R. The value of R is

Two waves represented by following equations are travelling in same medium y1=5 sin 2π (75t – 0.25x) and y2=10 sin 2π (150t – 0.50x). The intensity ratio I1/I2 of the two waves is

Two charges placed in air repel each other by a force of 10⁻⁴ N. When oil is introduced between the charges, the force becomes 2.5 x 10⁻⁵ N. The dielectric constant of oil is

The time period of bar magnet is doubled when magnetic field is reduced by same amount. If initial magnetic field is 0.4 x 10⁻⁴ T then find out decrease in the magnetic field

Two pendulums A and B are oscillating simultaneously with time period T and 5T/4 respectively. What is the phase difference between them after B completes one oscillation?

The r.m.s speed of the molecules of a gas in a vessel is 400 m/s. If half of the gas leaks out at constant temperature, the r.m.s speed of the remaining molecules will be

The magnetic susceptibility of a material of a rod is 449. Permeability of vaccum is 4 π x 10⁻⁷ henry/m. Absolute permeablity of the material of the rod in henry/meter is

The drift velocity of free electrons in a conductor is v, when a current I is flowing in it. If both, the radius and the current is doubled, then drift velocity will be

A solenoid 1.5 m long and 0.4 cm in diameter possesses 10 turns per cm length. A current of 5 A falls through it. The magnetic field at the axis inside the solenoid is

A body of mass m is placed on the earth’s surface. It is taken from the earth’s surface to a height h=3R. The change in gravitational potential energy of the body is

A bucket full of water is revolved in a vertical circle of 2m. What should be the maximum time period of revolution so that the water does not fall off the bucket?

A 1 kg particle strikes a wall with velocity 1 m/s at an angle 30° and reflects at the same angle. If it remains contact with wall for 0.1 sec, then the force is

The density of ice is 0.9 g/cc and that of sea water is 1.1 g/cc. An ice berg of volume V is floating in sea water. The fraction of ice berg above water level is

A bomb of mass 30 kg at rest exploded into two pieces of masses 18 kg and 12 kg. The velocity of 18 kg mass if 6 m/s. The kinetic energy of the other mass is

An unpolarised beam of intensity I is incident on a pair of nicols making an angle of 60° with each other. The intensity of light emerging from the pair is

The potential difference applied to an X-ray tube is 5 kV and the current through it is 3.2 mA. The number of electrons striking the target per second is

Starting from the origin, a body oscillates simple harmonically with a period of 2s. After what time will its kinetic energy by 75% of the total energy?

A body is moving in a vertical circle. The string must remain taut at the highest point. The centripetal acceleration when string is horizontal is

A capacitor of 10 µF charged upto 250 volt is connected in parallel with another capacitor of 5 µF charged upto 100 volt. The common potential is

The wavelength of the short radio waves, microwaves, ultraviolet waves are λ₁,λ₂ and λ₃ respectively. Arrange them in decreasing order.

Two wires of the same dimensions but resistivities p1 and p2 are connected in series. The equivalent resistivity of the combination is

When volume of a system is increased two times and temperature is decreased to half of its initial temperature, then pressure becomes

The total energy of an electron in the first excited state of hydrogen atom is about -3.4 eV. Its kinetic energy in this state is

Two masses of 9 g and 6 g are connected with a string which is passing over a frictionless pulley. Then common acceleration is

Heat is supplied at constant pressure to diatomic gas. The part of this heat that goes to increase its internal energy will be

The velocity of sound is V, in air. If the density of air is increased to four times, then the new velocity of sound will be