A bulb and a capacitor are connected in series to a source of alternating current. If its frequency is increased, while keeping the voltage of the souce constant, then
The photoelectic work function for a metal surface is 4.125eV. The cut-off wave length for this surface is
Three condenser of capacity C each are joined first in series and then in parallel. The capacity becomes n times, where n is
The angular speed of an engine wheel making 90 revolutions per minute is
If 2.2 kW power is transmitted through a 10 Ω line at 22000 V, the power loss in the form of heat will be
A parallel plate condenser is charged and disconnected from the battery. If the plates of the capacitor are moved further apart by means of insulting handles
Five resistors each of 1ohm are connected in parallel. The resultant resistance of the combination is
Resistances of 2 Ω and 3 Ω are connected in series. If the P.D across the 2 Ω resistor s 3V, the P.D across 3 Ω is
Which of the following radiations have the least wavelength?
Induction furnace is based on the heating effect of
A distance 'r' from a point charge, the ratio (where 'u' is energy density and 'V' is potential) is represented by:
A pulling force making an angle θ to the horizontal is applied on a block of weight W placed on a horizontal table. If the angle of friction is φ, the magnitude of force required to move the body is equal to
Escape velocity on earth is 11.2 km/s. What would be the escape velocity on a planet whose mass is 1000 times and radius is 10 times that of earth
Interference is possible in
At a common temperture, a block of wood and a block of metal feel equally cold or hot. The temperatures of block of wood and block of metal are
The Figure shows elliptical orbit of a planet m about the sun S. The shaded area SCD is twice the shaded area SAB. If t1 is the time for the planet of move from C to D and t2 is the time to move from A to B then:
One litre of helim gas at a pressure 76 cm of Hg and temperature 27ºC is heated till its pressure and volume are doubled. The final temperature attained by the gas is
If 10% of the current passes through a moving coil galvanometer of resistance 99 ohm, then the shunt resistance will be
A horizontal overhead power line is at a height of 4m from the ground and carries a current of 100A from east to west. The magnetic field directly below it on the ground is (μ0 = 4π x 10−7 TmA−1)
A charged particle is released from rest in a region of steady and uniform electric and magnetic fields, which are parallel to each other. The particle will move in a
Magnetic moment of a magnet is M. Maximum value of torque acting on this magnet when suspended in a uniform magnetic field of intensity B is
At a neutral point,
When a material is placed in magnetic field 'B'. Magnetic moment proportional to 'B' but opposite in direction is induced. The material is
Two soap bubbles are blown. In the first soap bubble, the pressure is 2 times that of the other soap bubbles. The ratio of their radii will be
If two soap bubbles of different radii are connected by a tube, then
A wire fixed at the upper end, stretches by length l by applying a force F. Work done in stretching done the wire is
If the wire is increased by infinite small length dl, then the work done
A fan of moment of inertia 0.6 kg x m2 is turned upto a working speed of 0.5 revolutions per second. The angular momentum of the fan is
A cannon after firing recoils due to
Which is not electromagnetic wave in the following?
The energy released per fission of a U235 nucleus is around
The displacement of a particle, moving in a straight line, depends on time (t) as: s = αt3 + βt2 + γt + δ. The ratio of its initial acceleration to its initial velocity depends
To increase both the resolving power and magnifying power of a telescope
A particle starts S.H.M. from the mean position. Its amplitude is A and time period is T. At the time when its speed is half of the maximum speed, its displacement y is
Two radiations containing photons of energy twice and five times the work function of the metal are incident successively on the metal surface. The ratio of the maximum velocities of the emitted electrons in the two cases will be
An aeroplane is flying horizontally with a velocity of 600 km/h and at a height of 1960 m. When it is vertically above a point A on the ground a bomb is released from it. The bomb strikes the ground at point B. The distance AB is
A metal surface of work function 1.07 eV is irradiated with light of wavelength 332 nm. The retarding potential required to stop the escape of photo-electrons is
The far point of a myopic eye is 1.5 m. To correct this defect of the eye, the power of lens is
Magnifying power of telescope can be increased by
The principle section of a glass prism is an isosceles triangle ABC with AB = AC the face AC is silvered. A ray of light is incident normally on the face AB and after two reflections, it emerges from the base BC perpendicular to the base. Angle of BAC of the prism is
Light takes time t₁ to travel a distance x in vacuum and time t₂ to travel 10 x in a medium. The critical angle of the medium will be
A circular disc is to be made by using iron and aluminium so that it acquires maximum moment of inertia about geometrical axis. It is possible with
A particle executing simple harmonic motion has an amplitude of 6cm. Its acceleration at a distance from the mean position 2cm is 8cms-2. The maximum speed of the particle is
p-type crystal of a p-n junction diode is connected to a positive terminal of battery and n-type crystal connected to negative terminal of battery
If the displacement equation of a particle be represented by y=A sin PT+B cos PT, the particle executes
Which of the following statement is true about p-type semiconductors?
A metallic wire with tension T and at temperature 30º C vibrates with its fundamental frequency of 1 KHz. The same wire the same tension but at 10º C temperature vibrates with a fundamental frequency of 1.001 KHz. The coefficient of linear expansion of the wire is
A drop of water breaks into two droplets of equal size. In this process, which of the following statement is correct
When a current is passed through a junction of two dissimilar metals, heat is evolved or absorbed at the junction. This process is called
An electric lamp is marked 60 W, 230 V. The cost of a 1 Kwh of energy is Rs. 1.25. The cost of using this lamp 8 hrs a day for 30 days is
If two electric bulbs have 40 W and 60 W rating at 220 V, then the ratio of their resistances will be
A metallic solid sphere is rotating about its diameter as axis of rotation. If the temperature is increased by 200º C, the percentage increased in its moment of inertia is (Coefficient of linear expansion of the metal = 10-5 / ºC )
In thermodynamic process, 200 Joules of heat is given to a gas and 100 Joules of work is also done on it. The change in internal energy of the gas is
The unit of angular momentum in C.G.S system
A container that suits the occurrence of an isothermal process should be made of
Which of the following is not the unit of energy
Light was producing interference have their amplitudes in the ratio 3:2. The intensity ratio of maximum and minimum of interference fringes is
When distance between source of light and observer decreases, then the apparent frequency of light
If an open pipe of length l vibrates in fundamental mode, then pressure variation is maximum at
Velocity of sound in air
I. Increases with temperature
II. Decreases with temperature
III. Increase with pressure
IV. Is independent of pressure
V. Is independent of temperature
Choose the correct answer
The displacement x of a particle moving in one dimension under the action of a constant force is related to the time t by the equation t - √x + 3, where x is in meters and t is in seconds. The displacement of the particle when its velocity is zero is
Below are the statements followed by four conclusions numbered I,II,III and IV. You have to consider the statements and the following conclusions and decide which of the conclusion(s) follows the statement(s).
a. All glasses are roads.
b. No road is a stick.
c. Some sticks are pens.
I. Some glasses are sticks.
II. Some pens are sticks.
III. Some roads are sticks.
IV. No glass is a stick.
From the Venn diagrams, it is clear that "some pens are sticks" (II), and "no glass is a stick" (IV), Hence, only conclusions II and IV follow.
The electrophile involved in the sulphonation of benzene is
1-Butyne reacts with cold alkaline KMnO₄ to yield
The reaction between primary amine, chloroform and alcoholic caustic potash is called
The homologue of ethyne is
C2H2 is Ethyne (homologue of alkyne)
C3H4 is propyne (homologue of alkyne)
C3H8 → propane (homologue of alkane)
C2H6 → Ethane (homologue of alkane)
Which of the following compounds on reaction with NaOH and Na₂O₂ gives yellow colour?
The de Brogile wave length of particle with mass 1 gram and velocity 100ms-1 is
Which of the following sequence is correct as per Aufbau principle?
What is the wave length (in m) of a particle of mass 6.62 x 10−29 g moving with a velocity of 103ms-1? (h = 6.62 x 10−34 J . s)
The structure and hybridisation of Si in si (CH₃)₄ are respectively
Which of the following alkyl group has the maximum + I effect?
Which of the following has covalent as well as ionic valency?
How much energy is released when 6 mol of octane is burnt in air ? Given that ∆fHº for CO₂(g),H₂O(g) and C₈H₁₈(l) respectively are -490,-240 and + 160 KJ mol⁻1.
A reversible reaction is said to have attained equilibrium, when
The half-life period depends upon
The calorific value of fat is
Pheromones are chemicals
In a closed insulated container a liquid is stirred with a paddle to increase the temperature. Which of the following is true
The IUPAC name of
CH₃CH = CHCOOC₂H₅ is
As per the modern periodic law the physical and chemical properties of elements are periodic function of their
Modern periodic law states " If the elements are arranged in order of their increasing atomic numbers, the elements with similar properties are repeated after certain regular intervals.
Among the following compounds that is both paramagnetic and coloured is :
According to the kinetic theory of gases, in an ideal gas, between two successive collisions a gas molecules travels
Which of the following compounds dissolve in both HCl and NaOH solutions
The strongest reducing agent of the alkali metal is
For an ideal gas, number of moles per litre in terms of its pressure P, gas contant R and temperature T is
In a galvanic cell, the electrons flow from
Among the alkaline earth metals the element forming predominantly covalent compound is
The products of the chemical reaction between Na₂S₂O₃, Cl₂ and H₂O are
Which of the following compounds of cement sets at the slowest rate?
The poisonous gas present in the exhaust fumes of cars is
Which one of the following is used as an acid flux in metallurgy?
The correct sequence of decrease in the bond angle of the following hydrides is
When I₂ is passed through KCl, KF, KBr solutions
Species acting both as Bronsted acid and base is
A similarity between optical and geometrical isomerism is that
Metal hydrides on treatment water gives
Which of the following is the strongest acid?
A mixture of a weak acid (say acetic acid )and its salt with a strong base (say sodium acetate )is a buffer solution.Which other pair of substances from the following may have a similar property ?
Formic acid is obtained when
In case of a radioisotope, the value to T1/2 and λ are identical in magnitude. The value is
How many monochlorobutanes will be possible on chlorination of n-butane?
Isotopes of elements were discovered by
Which of the following does not react with phenyl hydrazine?
Alcoholic beverages are made of
The reaction between alcohol and carboxylic acids is called
Most stable alkene is :
In the following, electrophile is:
HO ― NO2
Phenol, p-Methylphenol, m-Nitrophenol and p-Nitrophenol follows order of increasing acidic strength
Which of the following can not be detected by the Lassaigne's test in a compound?
The chemical formula of Iron (III) hexacyanoferrate (II) is
Orlon is a polymer of
10 ml of conc. H₂SO₄ (10 molar) is diluted to 1 litre. The approximate strength of dilute acid could be
The values of observed and calculated molecular weight of silver nitrate are 92.64 and 170 respectively. The degree of dissociation of silver nitrate will be
SnCl₂ gives a precipitate with a solution of HgCl₂. In this process HgCl₂ is
In which of the following reaction H₂O₂ is a reducing agent?
A f.c.c. crystal contains how many atoms in each unit cell?
Substances which rotate the plane polarised light are called:
The number of moles of oxygen in one litre of air containing 21% oxygen by volume, in standard conditions, is
Which of the following ions can cause coagulation of proteins?
Turnbull's blue is a compound called?
The + 3 ion of which one of the following has half-filled 4f subshell ?
First heart transplant was performed by
Class arachnida is characterised by
What is the stimulus for cholecystokinin release?
During protein catabolism, _____ is produced as an end product by the liver.
Damaged or old red blood cells are removed by the liver and _____.
Compared to the others listed below, which type of tooth is more likely to be involved in grinding food?
The largest phase of meiosis-I is
In Hydra nematocysts are maximum on:
Cotton fibres are made up of
Essential oils are those
Transgenic crops are useful as they have genes of
Which one of the following is the richest source of proteins?
MOET is a method of
Hormones thyroxine and adrenaline and pigment melanin formed from
Choose the correct sequence
Transition zone between two vegetational types is
Regulator gene controls chemical synthesis (Operon concept) by
The flow of energy in the biosphere is
Sulphur shower is caused by
Which of the following is an inherited disorder ?
Two individuals with similar external appearance but different genetic make up have the similar
A plant having 24 m long internodes is crossed with a plant having 12 cm long internodes. The hybrids have 18 cm long internodes due to
In humans, the recessive genes located on X-chromosome, are always
When birth and death rates are equal, the population is
Sea cows are aquatic mammals included under:
Which of the following is not an area that contains lymph nodes?
The lymphatic trunk that drains the upper limb is the _______________.
The intensity levels of whispering noise is
Sensation of stomach pain is due to
Little leaf/leaf rosetting is deficiency symptom of
The trees occuring in two storeys is the characteristic feature of
Starch is detected in food by its
Animals producing natural pearls belong to
pH of phloem sap is
In taxonomic hierarchy, various categories are arranged in
Auxin suppresses growth of
The oxides of sulphur and nitrogen are important pollutants of
Baggasse is related to the manufacture of
Nitrogen fixation occurs in
Size of grapes increases in application of
Which one of the following substances plays an important role in biochemical defence of host plants?
Acid rain will not affect
Roots can be used for vegetative propagation of
Metobolic water is the one
The simplest type of canal system in sponges is
Both corpus luteum and macula lutea is
Meiotic divisions in an ovule occur in
Enzyme helping in oxidative decarboxylation of pyruvic acid is
Oxygen-poor blood becomes oxygen-rich blood at the
Stem takes part in storage and perennation in
Earthworm is kept in 40% KOH for long. The structure left intact is
Which of the following would have the highest concentrations of both bicarbonate ions and reduced haemoglobin?
Companion cells in plants are associated with