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Joining of repeating units to form a macromolecules is called
Use the following characteristics to answer the question: one-way valves thin elastic layer near skeletal muscle These characteristics describe which type of vessel?
Cristae are associated with which of the following organelle?
RNA that picks up specfic amino acid from amino acid pool of cytoplasm to carry it to ribosome during protein synthesis is
Eschirichia coli with completely radioactive DNA was allowed to replicate is non-radioactive medium for two generations. Percentage of bacteria with radioactive DNA is
Had Mendal decided to study those traits together which are determined by linked genes, he would not have found out
In sickle cell anaemia, death occurs when lethal genes are present in
If an albino marries a normal woman and 50% offspring are albino, the woman is
Study of interaction of antigen and antibody in blood is
Among the following which one is not a modificatin of stem
If a fruit is developed from (2G) ovary with parietal placentation ,unilocular when young becoming bilocular at maturity and the length of the fruit is less than its breath,the fruit would be called as
Which of the following is least effective in photosynthesis
In which one of the following pathogens do the cells of promycelium after the germination of teleutospore produce infection hyphae instead of basidiospores?
The application of engineering and technological principles to the life sciences is called
Respiratory disorders occur due to automobile exhaust because of
Treatment of polluted water is carried out with the help of
Protozoa reproduce by several methods. Which protozoan reproduces both by binary fission and conjugation?
The part of the sperm that contains hydrolytic enzymes is the
Presence of different types of beaks in finches of Galapagos islands adapted to different feeding habits provides evidence for
Frequency of a gene in a population will increase if the gene is
Which substance is found in the glomerulus, Bowman’s capsule and efferent arteriole but is not normally found in the collecting duct?
If E₀ represents the peak value of the voltage in an A.C. circuit, the r.m.s. value of the voltage will be
The force experienced by the cathode rays when they pass through an electric field of intensity E → is
In compton scattering process, the incident X -rays radiations is scattered at an angle 600. The wavelength of the scattered radiations is 0.22 Å . The wavelength of the incident X - radiation in Å units is
Two spherical conductors each of capacity C are charged to potential V and -V. These are then connected by mean of a fine wire. The loss of energy is
The internal resistance of a primary cell is 4 Ω. It generates a current of 0.2 A in an external resistance of 21 Ω. The rate at which chemical energy is consumed in providing the current is
A galvanometer of resistance 36 Ω is changed into an ammeter by using a shunt of 4 Ω. The fraction f₀ of total current passing through the galvanometer is
If the length of a conductor is halved, then its conductance will be
A cell of internal resistance 1.5Ω and of e.m.f. 1.5 volt balances 500 cm on a potentiometer wire. If a wire of 1.5 Ω is connected between the balance point and the cell, then the balance point will shift
A beam of electrons is moving with constant velocity in a region having electric and magnetic fields of strength 20 Vm-1 and 0.5 T at right angles to the direction of motion of the electrons. What is the velocity of the electrons
When the length and area of cross-section both are doubled, then its resistance
If a half wave rectifire is used to convert 50 Hz a.c. into d.c., then the number of pulses present in rectified voltage is
50 Hz a.c. has 100 pulses/sec .
In half wave rectifier negative pulses are missing.
Therefore, rectified voltage has 50 pulses/sec.
An electromagnet has stored 648 J of energy, when a current of 9 A exists in its coils. If the current is reduced to zero in 0.3 s, then average induced e.m.f. in the coils is
Which of the following is/are not electromagnetic waves?
A sphere S1 of radius r1 encloses a total charge Q. If there is another concentric sphere S1 of radius r 2 > r 1 and there be no additional charges between S1 and S2, the ratio of electric flux through S1 and S2 is
Potential energy of two equal positive charges 1 μ C each held 1 m apart in air is
If a point charge q be rotated in a circle of radius r around a charge Q, the work done will be
A capacitor of capacitance 1 μ F is charged to 1KV. The energy stored in the capacitor in joules is
C = 1μF
V = 1KV
energy stored U = 1/2 (CV2)
= 1/2 x 1 x 12 = 0.5
Two equal charges q each are placed at a distance of 2a. If a third charge-2q is placed at the mid-point, then potential energy of the system is
A sheet of aluminium foil of negligible thickness is introduced between the plates of a capacitor. The capacitance of the capacitor
An electric current passes through a long straight wire. At a distance 5cm from wire, the magnetic field is B. The field at 20cm from the wire would be
In a chain reaction uranium atom gets fissioned forming two different materials. Then total weight of these put together is
When the light source is kept 20 cm away from a photo cell, stopping potential 0.6 V is obtained. When source is kept 40 cm away, the stopping potential will be
By increasing the intensity of incident light on the surface of a metal
An object of height 1.5 cm is placed on the axis of a convex lens of focal length 25 cm. A real image is formed at a distance of 75 cm from the lens. The size of image will be
O = 1.5
Which is true about the following? I An amplifier is necessarily an oscillator too II An oscillator is necessarily an amplifier too
When the p-end of the p-n junction is connected to the negative terminal of the battery and the n-end to the positive terminal of the battery, then the p-n junction behaves like
Which of the following relation is true about a transistor?
A semiconductor device is connected in a series circuit with a battery and a resistance. A current is found to pass through the circuit. If the polarity of the battery is reversed, the current drops almost to zero. The device may be
If the two slits in Young's experiment have width ratio 1:4, the ratio of intensity at maxima and minima in the interference pattern in
The light from a sodium vapour lamp passes through a single narrow slit and then through two close, parallel narrow slits. The single slit lies on the perpendicular bisector of the line joining the two close, parallel slits. An observer looking towards the lamp through the double slit will see
1-Phenylethanol can be prepared by reaction of benzaldehyde with
Which of the following does not turn Schiff's reagent to pink ?
Which of the following reagent react differently with HCHO and CH₃CHO and CH₃COCH₃
How many monochlorobutanes will be obtained on chlorination of n-butane?
The number of atoms in 4.25 g of NH₃ is approximately
Which of the following statements about ribose is incorrect?
The empirical formula of an acid is CH₂O₂, the probable molecular formula of acid may be
Among the naturally occuring carbohydrates, furanose ring is found in
Which reagent will bring about the conversion of carboxylic acids into esters ?
A liquid is in equilibrium with its vapour at its boiling point. The molecules in these two phases will have equal
Consider the following reaction occuring in a automobile engine 2C₈H₈(g) + 25O₂(g) → 16CO₂(g) + 18H₂O(g). The signs of ∆H, ∆S and ∆G for above reaction would be
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?
Trannquilisers are substances used for the treatment of
In thermodynamics, a process is called reversible when
Which of the following is produced by reaction of RCN in sodium and alcohol ?
The time required to deposit one millimole of aluminum metal from Al₂O₃, by passing 9.65 amperes through aqueous solution of aluminum ion is
The resistance of 1 N solution of acetic acid is 250 ohm, when measured in a cell of cell cosntant 1.15 cm⁻1. The equivalent conductance (in ohm⁻1 cm2 equiv⁻1) of 1 N acetic acid is
Methylphenylether can be obtained by reacting
By the Williamson synthesis
C6H5O - + CH3l → C6H5OCH3 + l -
The indicator that is obtained by coupling the diazonium salt of sulphanilic acid with N,N-dimethylaniline is
Out of Cu, Ag, Fe and Zn, the metal which can displace all others from their salt solutions is
Which one of the following substances is used in the laboratory for drying of neutral gases?
Which of the following is not used as a pigment in paints?
At STP, a container has 1 mole of Ar, 2 moles of CO2,3 moles of O2 and 4 moles of N2. Without changing the total pressure if one mole of O2 is removed, the partial pressure of O2
Total moles of gases = 10 Let the pressure be P
∴ Partial pressure of oxygen (po2) = 3P/10
No. of mol of O2 in the mixture after removal of 1 mol of O2 = 2
Total moles = 9
Partial pressure of oxygen after removal of O2 (p'o2) = 2P/9
Decrease in partial pressure of O2
= 3P/10 - 2P/9 = 0.078 P
% decrease = 0.078 P x 100/3P = 26%
Which of the following has the same oxidation state as that of Cr in K₂CrO₃
In a crystal, the atoms are located at the position of
Alkane, C5H12, in which all H-atoms are equivalent is:
Fill in the blank with appropriate word.
The bureaucrat was.........for his role in the scam.
Out of the given alternatives, choose the one which can be substituted for the given capitalised word.
The staff have felt ON EDGE since they heard the rumour about retrenchment.
Improve the sentence by choosing best alternative for capitalised part of the sentence.
Poor Tom LAID in the shade of a tree before he could walk further.