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Larva of 'Culex' floats on surface of water with its head
Cell recognition and adhesion occur due to biochemicals of cell membranes named
If the decomposers become extinct, the most severely affected would be
The organs which look different but having same basic principle structure and origin are known as
Out of 64 codons, 61 code for 20 types of amino acids. It is due to
A pregnant woman underwent amniocentesis. An extra barr body is present in the embryo. Syndrome likely to occur in child is
Patients with sex-linked disorder of Duchenne's muscular dystrophy die by the age of
Which one is required for photosynthetic evolution of oxygen ?
Which one of the following substances plays an important role in biochemical defence of host plants?
Small, thin walled elongated cells associated with sieve tube elements are
In coming years, skin related disorders will become more common due to
A person has impaired nervous system and signs of madness due to continued intake of metal contaminated water. The metal is
Which of the following store sperm cells and eliminate those that have major genetic defects?
Circulation of blood was discovered by and father of blood circulation is
Name the antibiotic used in the Lederberg's replica plating experiment
The scientist who proposed the first theory of evolution was
The inability to regulate the concentration of sodium ions in the blood could be due to improper functioning of the
The potential difference V and the current I flowing through an instrument in an A.C. circuit of frequency f are given by V = 5 cos ωt volts and I = 2 sin ωt amperes (where ω = 2πf). The power dissipated in the instrument is
In photoelectric phenomenon, the number of photo electrons emitted depends on
Photoelectric current depends on the intensity of incident light,
the number of photoelectrons emitted per second is directly proportional to the intensity of incident radiation.
An air capacitor of capacity C = 10μ F is connected to a constant voltage battery of 12 volt. Now the space between the plates is filled with a liquid of dielectric constant 5. The charge that flows now from battery to the capacitor is
C = 10 μ F
Charge in capacitor q = CV
= 10 x 12
= 120 μ C
On keeping liquid of dielectric constant5, capacity will becomes of 5 time.
∴ Charge q = 5 x 120
= 600 μ C
The relation between Faraday constant F, electron charge e, and Avogardo Number N is
Consider telecommunication through optical fibres. Which of the following statements is not correct
A steady current is passing through a conductor of non-uniform cross-section. The net quantity of charge crossing any cross-section per second is
For a cell, the terminal potential difference is 3.6 V, when the circuit is open. If the potential difference reduces to 3 V, when cell is connected to a resistance of 5 Ω, the internal resistance of cell is
When a resistance of 2 Ω is connected across the terminals of a cell, the current is 0.5 amperes. When the resistance is increased to 5 ohm, the current is 0.25 amperes. The internal resistance of the cell is
In an electron gun the control grid is given to negative potential relative to cathode in order to
In an ideal transformer, the voltage and the current in the primary are 200 V, 2A and that in the secondary are 2000 V, 1A. The value of is (in A).
Which of the following rays are not electromagnetic waves?
If the electric flux entering and leaving an enclosed surface respectively is φ₁ and φ₂, the electric charge inside the surface will be
An electron of charge e coulomb passes through a potential difference of V volt. Its energy in joule will be
A hollow metal sphere of radious 10 cm is charged such that the potential on its surface is 80V. The potential at the centre of the sphere is
A point charge Q is placed at a distance d from the centre of an uncharged conduction sphere of radius R. The potential of the sphere is d > R :
In C.G.S system the capacity of a spherical conductor is numerically equal to its
If 4x1020 eV of energy is required to move a charge of 0.25 coluomb between two points, the p.d between them is
A charged particle moving in a magnetic field experiences a resultant force
If MO is the mass of an oxygen isotope 8O17 , Mp and Mn are the masses of a proton and a neutron, respectively, the nuclear binding energy of the isotope is
The radio of the radii of the nuclei 13Al27 and 52Te152 is
In photoelectric effect, the work function of a metal is 3.5 eV. The emitted electrons can be stopped by applying a potential of -1.2 V. Then
A cesium photocell, with a steady potential difference of 60 V across it, is illuminated by a bright point source of light 50 cm away. When the same light is placed 1 metre away, the photoelectrons emitted from the cell
In a Huygen's eye piece with an eyepiece of focal length F, the distance between the eye-piece and field lens should be
The impurity to be added to get n - type semiconductor is
The energy gap of silicon is 1.14 eV. The maximum wavelength at which silicon will begin absorbing energy is
P-type semiconductor is formed when
A. As impurity is mixed in Si
B. Al impurity is mixed in Si
C. B impurity is mixed in Ge
D. P impurity is mixed in Ge
If the ratio of intensities of two waves causing interference be 9:4, then the ratio of maximum and minimum intensities will be
In young's double slit experiment, the intensity of central maximum is I. It one slit is closed, the intensity at the same place will become
Both light and sound waves produce diffraction. It is more difficult to observe the diffraction with light waves because
Which of the following enzymes converts glucose into ethyl alcohol?
A compound possessing α-hydrogen atom, in the presence of dilute alkali forms β-hydroxy aldehyde. This product on heating with dilute acid forms an unsaturated crotonaldehyde. The compound is
Which of the following does not give red ppt. with Fehling solution?
Which alkene gives the same product by the Markownikoff's and anti-Markownikoff's method
4.4 g of an unknown gas occupies 2.24 L of volume at standard temperature and pressure. The gas may be
Which carbohydrates is an essential constituent of plant cells?
Glucose when treated with CH₃OH in the presence of dry HCl gives α and β-methylglucodsides because it contains
Which of the following compounds on boiling with KMnO₄ and the subsequent acidification will not give benzoic acid ?
The acid showing salt like character in aqueous solutions is
A cylinder filled with a movable piston contains liquid water in equilibrium with water vapour at 25oC. Which one of the following operations results in a decreace in the equilibrium vapour pressure ?
Two moles of HI was heated in a sealed tube at 440oC till the equilibrium was reached. HI was found to be 22% decomposed. The equilibrium constant for dissociation is
Heat exchanged in a chemical reaction at constant temperature and pressure is called
In which of the following reactions, heat liberated is known as standard heat of formation of CO2?
An alkane C7H16 is produced by the reaction of Lithium di (3-pentyl) cuperate with ethyl bromide. The structural formula of product is
In a closed insulated container, a liquid is stirred with a paddle to increase its temperature. In this process, which of the following is true?
The IUPAC name of the following compound
CH₃-C(CH₃)₂-CH = C(CH₃)₂ is
One mole of complex compound Co(NH₃)₅ Cl₃ gives 3 mol of ions on dissolution in water. One mol of same complex reacts with two mol of AgNO₃ solution to form two mol of AgCl(s). The struture of complex is
Compound A has a molecular formula C₇H₇NO on treatment with Br₂/KOH, A gives an amine B which respond to carbylamine test. B on diazotisation and coupling with phenol give an azo dye. A can be
When 9.65 Coulombs of electricity is passed through a solution of silver nitrate (atomic weight of Ag = 107.87 taking as 108.0) the amount of Silver deposited is
In which cell of the free energy of a chemical reaction is directly converted into electricity ?
tert-Butyl methyl ether on heating with HI of one molar concentration gives
According to the kinetic theory of gases, in an ideal gas, between two successive collisions a gas molecules travels
Which of the following substance acts as an oxidising as well as a reducing agent ?
The crystal system of a compound with unit cell dimensions a=0.387, b=0.387 and c=0.0504 nm and α = β = 900 and γ = 1200 is
Fill in the blank with appropriate word.
.......... works of reference are so valuable as the Encyclopaedia Britannica.
Choose the alternative which best expresses the meaning of the idiom/phrase.
To pour oil in troubled water
Improve the sentence by choosing best alternative for capitalised part of the sentence.
Most people feel that the most important reason to recycle is ITS EMPECT on future generations.