The ratio of secondary to primary turns is 9:4. If power output (neglect all losses) to power input
The transition from the state n = 4 to n = 3 in hydrogen like atom results in ultraviolet radiation. Infrared radiation will be obtained in the transition from-
Which of the following is true about working of a photocell
A particle carrying a charge 'e' is fired perpendicularly in to a uniform magnetic field of induction B with a momentum 'p'; then the radius of circular path is
An electron is travelling horizontally towards east. A magnetic field is vertically downward direction exerts a force on the electron in the direction of
When cells are connected in parallel, then
When connected across the terminals of a cell, a voltmeter measures 5V and a connected ammeter measures 10 A of current. A resistance of 2 ohms is connected across the terminals of the cell. The current flowing through this resistance will be
A car is moving in a circular horizontal track of radius 10 m with a constant speed of 10 m/sec. A plump bob is suspended from the roof of the car by a light rigid rod of length 1.00 m. The angle made by the rod with track is
Which of the following is true for photon
Light of frequency v is incident on a certain photoelectric substance with threshold frequency v₀. The work function for the substance is
Cathode rays are similar to visible light rays in that
What is the cause of "Green house effect"?
Mutual inductance of two coils can be increased by
∴ M can be increased by increasing the number of turns in the coils.
Radio wave diffract around building although light waves do not. The reason is that radio waves:
Sixty four identical drops each charged by q coulomb to potential V volt coalesce to form a single large drop. The charge and potential on the large drop are respectively
A charge Q is divided into two parts as q and (Q - q) so that for any given separation between q and (Q - q), the electrostatic interaction between q and (Q - q) is maximum. The ratio Q/q is
The ratio of energy required to raise a satellite to a height 'h' above the earth's surface to that required to put it into the orbit of radius R is
Consider the following statements
Assertion (A) : When temperature increases, the colour of a star shifts towards smaller wavelength, i.e., towards violet colour
Reason (R) : Red colour has maximum wavelength
Of these statements
The equation for an ideal gas is PV = RT, where V represents the volume of
The cyclotron frequency of an electron gyrating in a magnetic field of 1 T is
A light spring balance hangs from the hook of the other light spring balance and a block of mass M kg hangs from the former one. Then the true statement about the scale reading is
Two magnets are held together in a vibration magnetometer and are allowed to oscillate in the earth's magnetic field with like poles together, 12 oscillations per minute are made but for unlike poles together only 4 oscillations per minute are executed. The ratio of their magnetic moments is
A vibration magnetometer is placed at South pole, then the time period will be
If two soap bubbles of different radii are connected by a tube, then
According to the Hooke's law, if stress is increased, then ratio of stress to strain
The first atomic reactor was constructed by
The reason for the continuous emission of energy by the sun is
A nuclear reactor has a power of 16 Kw. If the energy per fission is 200 MeV, the number of fissions per second is
The length of a spring is 'a' when a force of 4 N is appled on it. The length is β when 5 N force is applied. Then the length of spring when 9 N force is applied is
The resolving power of a telescope depends on
A double convex lens of glass (μ = 1.5) is immersed in water (μ = 4/3). If the focal length of the lens in air is ′ f ′. Focal length in water is
A cord is wound round the circumference of a wheel of radius r. The axis of the wheel is horizontal and the moment of inertia about it is I. A weight mg is attached to the cord at the end. The weight falls from rest. After falling through a distance h, the angular velocity of the wheel will be
To move a body in a circle, which of the following force is needed?
The minimum phase difference between the two simple harmonic oscillations y₁ = (1/2)sinωt+(√3/2)cosωt and y₂ = sinωt+cosωt is
At 0K, intrinsic semiconductor behaves as
In a good conductor the energy gap between the conduction band and the valence band is
A heater draws a current of 2 A when connected to a 250 V source. The rate of energy dissipation is
19g of water at 30°C and 5g of ice at − 20°C are mixed together in a calorimeter. What is the final temperature of the mixture ? Given specific heat of ice = 0.5 cal g − 1(°C)− 1 and latent heat of fusion of ice = 0.8 cal g − 1
Starting with the same initial conditions, an ideal gas expands from volume V₁ to V₂ in three different ways. The work done by the gas is W₁ if the process is purely isothermal, W₂ if purely isobaric and W₃ if purely adiabatic. Then
The dimensions of the Gravitational constant G are
Decible is unit of
Two vibrating strings of the same material but lengths L and 2L have radii 2r and r respectively. They are stretched under the same tension. Both the strings vibrate in their fundamental modes, the one of length L with frequency n₁ and the other with frequency n₂. The ratio n₁/n₂ is given by
Two masses of 'M' and '4M' are moving with equal kinetic energy. The ratio of their linear moments is
If the momentum of a body increases by 0.01%, its kinetic energy will increase by
A spring of force costant 10 N/m has an initial stretch 0.20 m. In changing the stretch to 0.25 m, the increase in potential energy is about
The most suitable reagent for the conversion of RCH₂OH → RCHO is :
In which of the following reactions, both oxidised and reduced forms of the same compound are obtained?
Rutherford's experiment on scattering of α -particles showed for the first time that the atom has
The quantum numbers of an atom can be defined on the basis of
Which of the following does not show electromeric effect?
The alkyl halide is converted into ethyl alcohol by
An organic compound with the formula C₆H₁₂O₆ forms a yellow crystalline solid with phenylhydrazine and gives a mixture of sorbitol and mannitol when reduced with sodium. Which among the following could be the compound?
The reaction of chloroform with alcoholic KOH and p-toludine forms
Which of the following has pπ - dπ bonding?
KF combines with HF to form KHF₂. The compound contains the species
In aqueous solutions, HF dissociates and gives the difluoride ion (HF2−) instead of F− ions. This is because F− forms H-bond with HF. Therfore, the species [H.....F−H]− or HF2− exists.
The enthalpy of combustion of C(graphite) and C (diamond) are -393.5 and -395.4 KJ mol⁻1 respectively .The enthalpy of conversion of C(graphite) to C (diamond) in KJ mol⁻1 is
Combustion of glucose takes place according to the reaction: C₆H₁₂O₆ → 6CO₂ + 6H₂O. If change in enthalpy in the reaction is -300 KJ, then heat evolved in the combustion of 1.5 g of glucose will be (Molecular weight of glucose = 180)
The equilibrium between water and its vapour, in an open-vessel
In an open vessel, the water vapour diffuse into air and therefore, the concentration of water vapour above water surface is negligible.
The reverse process of condensation of vapour into liquid form is almost absent.
Therefore, evaporation process continues, till the entire water changes into vapour form.
Therefore, in an open vessel, the water vapour system is never in equilibrium.
Finally the whole water will diffuse into air as water vapour.
If concentration of reactants is increased by 'x' then the k becomes
Standard enthalpy and standard entropy changes for the oxidation of ammonia at 298 K are - 382.64 kJ mol-1 and - 145.6 JK-1 mol-1 respectively. The standard Gibbs energy change for the same reaction 298 K is
NH3(g) + 3 4 O2(g) → 1/2 N2(g) + 3/2 H2O (l)
T = 298 K
ΔH = - 382.64 kJ mol-1
ΔS = - 145.6 JK-1 mol-1
= - 0.1456 kJ K-1 mol-1
ΔG = ΔH - TΔS
= -382.64 kJ mol-1 - (298 K) x (0.1456 k JK-1 mol-1)
= -382.64 kJ mol-1 + 43.3888 kJ mol-1
= -339.25 kJ mol-1 ≅ - 339.3 kJmol-1
Which of the following can possibly be used as analgesic without causing addiction and any modification?
IUPAC name of CH₃CH = CH-C ≡ CH is
The type of isomerism exhibited by pentamminenitro chromium (III) chloride is
A Carnot engine receives heat at 227°C and exhausts at 47°C. If its efficiency is to be increased by 5 % then the engine should receive heat at
Which of the following complex ion is paramagnetic?
The standard E°red. values of A,B,C are 0.68V,- 2.54 V,-0.50V respectively.The order of their reducing power is
In the chemical reaction, Ag₂O + H₂O + 2e⁻ → 2Ag + 2OH⁻
The famous Taj Mahal is threatened due to the effect of
The number of electrons passing per sec through a cross section of copper wire carrying 10-6 ampere is found to be equal to
In the extraction of copper from its sulphide ore the metal is formed by reduction of Cu₂O with
In deriving the kinetic gas equation, use is made of the root mean square velocity of the molecules because it is
If the pressure and absolute temperatre of 2 litres of CO₂ are doubles, the volume of CO₂ would become
Sulphide ores are generally concentrated by
Which of the following is not correct?
Ammonium ion is
Which one of the following species is not a pseudohalide?
Aqueous solution of sodium acetate is
Which one of the following methods is neither meant for synthesis nor for separation of amines ?
Maximum hyperconjugation is observed in :
Synthetic polymer prepared from caprolactum is known as
Among the bromide I-III given below, the order of their reactivity in the SN1 reaction is:
In Carius tube the compound ClCH₂-COOH was heated with fuming HNO₃ and AgNO₃. After filtration and washing, a white ppt. was formed. The ppt. is
0.24 g of a volatile liquid on vaporization gives 45 ml of vapours at STP.What will be the vapour density of the substance ?(Density of H₂ = 0.089 gL⁻1)
The charge on cobalt in [Co(CN)₆]⁻3 is
Calculate the normality of 10 volume H₂O₂
The molarity of a solution prepared by adding 7.1 g of Na₂SO₄ (formula weight 142 amu) to enough water to make 100 ml volume is
If the formula weight of H2SO4 is 98. The amount of the acid present in 400ml of a 0.1 molar solution of the acid will be
Smoke is an example of
Which of the following has maximum unpaired electrons ?
The metal which is not ferromagnetic is
Floridean starch is found in
Frog's kidney is
In case of dicot roots the cork cambium is derived from
Gametophytic generation is dominant in
What are liverworts
In mitotic metaphase, each chromosome is
Which of the following occurs more than one and less than five in a chromosome ?
Which one controls movement of substances across cell membrane?
Lampbrush chromosomes are observed in
Middle lamella is
Barr body represents
Addition of individual chromosomes in mutation called
Together, leukocytes and platelets comprise approximately _____ percent of total blood volume.
Complications of aplastic anemia generally do not include:
Sunil's blood type was determined to be AB+. Which of the following is true of Sunil's blood?
Which type of white blood cells are concerned with the release of histamine and the natural anticoagulant heparin?
The interferons are :
In IVF technique, fusion of ovum and sperm occurs in:
Amniocentesis is the withdrawal of amniotic fluid in :
The main part of the stomach is the _______________ of the stomach.
Which of these is a hormone name?
A treeless biome is
Hypophysis is the alternate name of
Endoenzymes generally act at
The fossil of Australopithecus was first discovered in
The word enzyme was coined by
The seed of Gymnosperm differ from angiosperm in having -
Coupling and repulsion are the two faces of
Mendel's work was got republished in 'Flora' by
Epistasis implies :
Rheoreceptors are receptors for
Vaccines produced through geneticengneering are safe as
What is true about T-lymphocytes in mammals?
T.T and TAB second booster dose is give at the age of
Surgical removal of thymus of a new born shall result in failure to produce
What is common in Whale, Bat and Rat?
Both male and female pigeons secrete milk through
Mycorrhizal association are found in Pinus, Ficus and
Gram (-) ve bacteria possess peptidoglycan and an extra layer of
Which is source of Vitamin B₁₂
A fatty acid not synthesised in human body is
Plants detoxify heavy metals by means of
Which of the following is wrong in relation to photorespiration ?
Nonsymbiotic nitrogen fixing prokaryote is
Wings of cockroach arise from
Ovaries in cockroach lie embedded in the
Ootheca of Earthworm is produced by
In earthworm setae occur in all segments except
Air pollution effects are, usually, found in
Stilt roots are found in
Match the correctly matched palmate compound leaf type
Which fruit is a type of true nut
Which of the following would occur if an impulse from the SA node were blocked before it reaches the AV node?
Synecology is study of
The carnivorous fish, Gambusia, is introduced in the lakes, ponds to control a deadly disease in India, feeds on the larvae of :
A person feels extremely thirsty, drinks large amount of water, feels tired and weak. These the are symptoms of
Both coffee and tea are classified as
In yeast alanyl t-RNA the number of nucleotides are
Haploid plant cultures are got from
Rennin employed in cheese industry is
The chemical formula of cocaine is
The essential fatty acid in the diet of many experimental animals is
H.G.Khorana was awarded the Nobel prize for
Worms of Platyhelminthes are
Which one contains only living cells ?
Which among the following is an air pollution indicator?
In ferns vascular bundle is
Some effects of sulphur dioxide and its transformation products on plant include
Permanent decrease in population would occur due to
Population decline is the reduction over time in a region's population.
The decline can be caused by several factors including sub-replacement fertility (along with limited immigration), heavy emigration, disease, famine, and war.
The atmospheric pollutant, which is not produced by automobile exhaust is
A mutually beneficial association necessary for survival of both partners is
Amino acids are formed during digestion of
Embryo developed from nucellus and integument. This is known as
In angiosperms how many microspore mother cells are required to produce 100 pollen grains
Pollen grains are shed at
Positive feedback controls the secretion of which of the following hormones?
Normally menstruation occurs when
The human egg and sperm are similar in that
The presence of human chorionic gonadotropin (HCG) in a woman’s urine indicates that she
The characteristic feature of malvaceae is -
The inability to regulate the concentration of sodium ions in the blood could be due to improper functioning of the
The bicollateral vascular bundle is the characteristic feature of plants belonging to the family-
Aldosterone is secreted by the
Tetany (irregular muscle contraction) and osteoporosis are caused due to the deficiency of
The glomerulus is located between the
The correct sequence for the path of urine is 1. Ureter. 2. Urethra. 3. Kidney. 4. Urinary bladder