The primary winding of transformer has 500 turns whereas its secondary has 5000 turns. The primary is connected to an AC supply of 20 V, 50 Hz. The secondary will have an output
Two ions of the same charge and energy but different mass are passing through a uniform magnetic field. The radii of their paths are proportional to
A satellite revolving round the earth, the required centripetal force is provided by—
A 6 V battery is connected to the terminals of a 3 m long wire of uniform thickness and of resistance 100 Ω. The potential difference between two points on the wire, separated by a distance of 50 cm will be
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 colour sequenece in a carbon resistor is red, brown, orange and silver. The resistance of the resistor
The current in a choke changes from 0 to 10 A in 5 seconds. If the inductance of the choke is 2H the induced emf is
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 scientist experimentally proved the existance of electromagnetic waves?
Three capacitors each of capacity 4 μF are to be connected in such a way that their effective capacitance is 6 μF. This can be done by connecting
A cube of weight 10N rests on a rough inclined plane of slope 3 in 5. The coefficient of friction is 0.6. The minimum force necessary to start the cube moving up the plane is
If a person moves from the pole to the equator, the value of his weight will
When a glass rod is rubbed with silk, both become charged due to
Two stars of mass m1 and m2 are parts of a binary star system. The radii of their orbits are r1 and r2 respectively, measured from the C.M. of the system. The magnitude of gravitational force m1 exerts on m2 is
If the temperature of a hot body is increased by 50% then the increase in the quantity of emitted heat radiation will be
In Young's double slit experiment, interference was observed, when air was present in the interference chamber. If the chamber is evacuated and the same light is used, then we will see
The kinetic energy per gm mol for a diatomic gas at room temperature is
An electric current passes through a long straight copper wire. At a distance 5 cm from the straight wire, the magnetic field is B. The magnetic field at 20 cm from the straight wire would be
A conductor of length l carrying current i is placed perpendicular to magnetic field of induction B. The force experienced by it is
A bar magnet is held perpendicular to a uniform magentic field. If the torque acting on the magnet is to be halved by rotating it, then angle by which it is to be rotated, is
If a diamagnetic subsatnce is brought near north or south pole of a bar magnet it is
A current carrying rectangular coil is placed in a uniform magnetic field. In which orientation, the coil will not tend to rotate?
If a substance is to be paramagnetic, its atoms must have a
In a container, the velocity of water flowing through a hole at a depth h from the surface of water is 5 m-s⁻1. If the container has the hole at a depth 4h from the surface of water, then velocity of water flowing through the hole is
Soap bubbles can be formed floating in air by blowing soap solution in air, with the help of a glass tube, but not water bubbles. It is because
The normal density of gold is ρ and its bulk modulus is K. The increase in density of a lump of gold, when a pressure P is applied uniformly on all sides, is
The moment of inertia of a body comes into play
A particle starts from rest, accelerates at 2 m/s2 for 10s and then goes for constant speed for 30s and then decelerates at 4 m/s2 till it stops. What is the distance travelled by it
A mass 1 kg is suspended by a thread. It is (1) lifted up with an acceleration 4.9 m/s2 (ii) lowered with an acceleration 4.9 m/s2 The ratio of the tensions is
Which of the following is more effective in inducing nuclear fission
The masses of neutron, proton and deuteron in a.m.u are 1.00893 1.00813 and 2.01473 respectively. The packing fraction of the deuteron in a.m.u is
The magnifying power of a telescope is 'm'. If the focal length of the eye piece is doubled, then its magnifying power will become
If the metal bob of a simple pendulum is replaced by a wooden bob, then its time period will
The threshold wavelength for photoelectric effect of a metal is 6500 Å. The work function of the metal is approximately
The photoelectric threshold of a certain metal is 3000 Å. If the radiation of 2000 Å is incident on the metal
The photoelectrons will be emitted because wavelength of incident radiation is less than threshold wavelength (λ < λ0)
When a body is thrown with a velocity u making an angle θ with the horizontal plane, the maximum distance covered by it in horizontal direction is
If the luminous intensity of a unidirectional bulb is 100 candela, then total luminous flux emitted from the blub, is
Convex lens made up of glass (μg = 1.5) and radius of curvature R is dipped into water. Its focal length will be (Refractive index of water = 4/3)
Band spectrum is formed due to
A point source of light is placed 4 m below the surface of water of refractive index 5/3. The minimum diameter of a disc, which should be placed over the source, on the surface of water to cut off all light coming out of water is
Total K.E. of a sphere of mass M rolling with velocity V is
A particle, moving along the x-axis, executes simple harmonic motion when the force acting on it is given by (A and k are positive constants)
A body of mass 'm' when hung from a long and light spring stretches by 20cm. The period of vibration of the mass when pulled down and released is
Which statement is correct
At room temperature, a P-type semiconductor has
Two sound waves are y = A sin (ωt − kx) and y = A cos (ωt − kx) . Phase difference between them is
The resistance of a heater coil is 110 ohm. A resistance R is connected in parallel with it and the combination is joined in series with a resistance of 11 ohm to a 220 volt main line. The heater operates with a power of 110 watt. The value of R in ohm is
Two soap bubbles are blown. In the first bubble excess pressure is 4 times of 2nd bubble. The ratio of radii of first to second soap bubble is
The resistance of a cell does not depend on
The coefficient of linear expansion of brass and steel are α1 and α2. If we take a brass rod of length l1 and steel rod of length l2 at 0°C, their difference in length (l2 - l1) will remain the same at all temperatures if
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
Internal energy of a real gas is independent of
A physical quantity P is related with four variables a, b, c and d as : P =a3 b2/√c.d. The error of measurement in a, b, c and d are 1%, 3%, 4% and 2% respectively. What is the error in the quantity P?
A gas performs no work, when it expands
The units of angular momentum are
What is the effect on the interference fringes in a Young's double slit experiment, if the monochromatic source is replaced by another monochromatic source of shorter wavelength?
In Young's experiment of double slit, the intensity of central bright band is ---- times the individual intensities of the interfering waves
Two closed organ pipes, when sounded simultaneously gave 4 beats per sec. If longer pipe has a length of 1m. Then length of shorter pipe will be, (υ = 300 m/s)
Mechanical waves on the surface of a liquid are
A body of mass 50 kg slides over a horizontal distance of 1 m. If coefficient of friction between their surfaces is 0.2, then work done against friction is
The number of π -bonds in the product formed by passing acetylene through dil-H2SO4 containing mercuric sulphate is
1,3-Dibromopropane reacts with metallic zinc to form
1-Butyne reacts with cold alkaline KMnO₄ to yield
Acetylene reacts with ammonical silver nitrate to form
Ions of Ca, Ba and Sr precipitate in fifth group as their
Particle nature of electron was experimentally demonstrated by
Which one of the following pairs of ions have the same electronic configuration?
According to which of the following rule, nitrogen atom, has three unpaired electrons?
Which of the following molecule has dipole moment greater than zero?
which of the following hybridisation occurs in the formation of methane molecule?
The internuclear distance in H2 and Cl2 molecules are 74 and 198 pm respectively. The bond length of HCl is
In an adiabatic expansion of ideal gas,
If concentration of reactants is increased by 'x' then the k becomes
In which of the following reactions, the increase in volume of the container will favour the formation of products?
If in a container, no mass and heat exchange occurs, then it constitutes a/an
Given that heat of neutralisation of strong acid and strong base is -57.1 kJ. Calculate the heat produced when 0.25 mole of HCl is neutralised with 0.25 mole of NaOH in aqueous solution.
The heat produced when 0.25 mole of HCl is neutralised with 0.25 mole of NaOH in aqueous solution is 57.1 x 1/4=14.275kJ
Which of the following is a cationic detergent?
The IUPAC name of (CH₃)₂CH-CH₂-CH₂Br is
Which of the following metal requires radiation of highest frequency to cause emission of electrons?
As the alkali metals have minimum ionisation potential in the periodic table, secondly ionisation potential decreases on moving top to bottom in periodic table, thus Mg has highest ionisation enthalpy among the given elements, hence it requires radiation of highest frequency to cause emission of electrons.
When K₂O is added to water, the solution is basic because it contains a significant concentration of
The standard oxidation potentials Eº for the half cell reactions are Zn → Zn2⁺ + 2e⁻ ; Eº = +0.76V Fe → Fe2⁺ + 2e⁻ ; Eº = +0.41V EMF of the cell reaction Fe2⁺ + Zn → Zn2⁺ + Fe will be
CuSO₄ dissolve in ammonia due to the formation of
Oxygen and cyclopropane at partial pressure of 570 torr and 170 torr respectively are mixed in a gas cylinder. What is the ratio of the number of moles of cyclopropane to the number of moles of oxygen ?
An ideal gas, obeying kinetic theory of gases, can be liquefied if
The reactivity of the alkali metal sodium with water, is made use of
Gun metal is an alloy of
Which of the following is most dense?
Which of the following compound is commonly known as inorganic benzene?
Which of the following oxides of Nitrogen is anhydride of HNO3
Bromine is obtained on a commercial scale from
Bromine water reacts with SO₂ to form ?
0.1 M solution of which one of these substances will react basic ?
Which of the following is not a Lewis acid ?
One mol of magnesium nitride on reaction with an excess of water gives
The chemical formula of gypsum is
A white salt is readily solubule in water and gives a colourless solution with a pH of about 9. The salt would be
Molecular formula C5H12O will show :
Which of the following reagents is used to distinguish between methanoic acid and ethanoic acid ?
Which of the following compounds gives benzoic acid on oxidation?
Hydrogen bomb is based on the principle of
Acetal is produced by reacting an alcohol in the presence of dry HCl with
The nuclear reaction ₁H2 + ₁H2 → ₁H3 + Energy is called
Which of the following does not give iodoform test
Which one of the following is reduced with Zn and HCl to give the corresponding hydrocarbon?
Which of the following compounds can react with the Lewis base Cl− in a Lewis acid-base reaction?
Which does not contain conjugate system?
In dienes, when the double bonds connected to each other by a single bond, this arrangement is known as conjugated.
Increasing order of acid strength among p-methoxyphenol, p-methylphenol and p-nitrophenol is
Electron withdrawing groups increase the acid strength while electron releasing groups decrease the acid strength of the phenol.
-NO2 group is strongly withdrawing group while -CH3 is mildly releasing and -OCH3 is strongly releasing group. Thus, p-methoxyphenol is the weakest acid while p-nitrophenol is the strongest acid among the given compounds.
Which type of isomers are [Co(NH₃)₅Br]SO₄ and [Co(NH₃)₅SO₄]Br?
As a result of Frenkel defect, the density of a solid
A compound contains atoms of three elements : A,B and C. If the oxidation number of A is + 2, B is + 5 and that of C is -2, the possible formula of the compound is
Nitrogen in an organic compound can be estimated by
Which of the following is not a redox reaction?
The solubility of a solid in a liquid depends upon
Molarity of HCl (ℓ) if its density is 1.17 g/cc
Which of the following can exhibit optical isomerism?
The simplest way, to check whether a system is colloid or not is by
An organic compound containing C and H has 92.3% of carbon. Its empirical formula is
Which one of the following is a diamagnetic ion?
Sc3+ is diamagnetic Since it does not contain any unpaired electron while others contain
Copper is extracted from copper pyrites ore by heating in a blast furnace. The method is based on the principle that
Structures which help in distiguishing male cockroaches from female are
Which blood components transport most of the gases?
Which one of the following leucocytes transforms into marcophages?
Penetrants and stenoteles are names of nematocysts in a Hydra of these:
An increase in which of the following would cause hypotension?
Which gastrointestinal layer is characterized by having tough, fibrous connective tissue?
Chiasmata are first seen in
Forest Research Institute is situated at
The main component of the jute fibre is
Black wood is obtained from
Which of the following is a function of insulin?
Which of the following is the most important cereal of temperate region?
The "chicory powder" which is mixed with coffee powder is obtained from
Types of food chains are
Zona glomerulosa or glomerular area of adrenal cortex is involved in
Biological equilibrium is found in
Submerged hydrophytes have a well developed
TSH stands for
A female silk moth lays
Albinism is a congenital disorder resulting from the lack of the enzyme :
In sweet peas genes C and P are necessary for colour in flowers. The flowers are white in the absence of either or both the genes. What will be the percentage of coloured flowers in the offspring of the cross Ccpp x ccPp?
According to which theory will the human population outrun food supply?
In mendel's experiment, the F₁ generation showed only 'tall' plants because
The largest known ovule, largest male and female gametes and largest plants are found among -
Experimental evidence supporting concept of triplet genetic code was first provided by
This disorder of eye is only associated with old age
The functional kidney of frog's tadpole is
The vestibular apparatus consists of the
One of the following is a stimulant
What would happen if the pectoral lymph nodes were removed during a surgical procedure?
Which of these is not a function of lymph nodes?
Octopus is a member of class
Possibility of coal in an area is guessed through
The percentage of light energy utilised for photosynthesis by higher plants is
Cavity lodging lungs is
Exanthema is result of deficiency of
In photosynthesis, photolysis of water is used in
In the five kingdom system of classification, which single kingdom out of the following can include blue-green algae, nitrogen fixing bacteria and methanogenic archaebacteria ?
Rennet is used in
Nitrogen fixation occurs in
Example of positive geotropism is
Which one of the following substances plays an important role in biochemical defence of host plants?
Size of grapes increases in application of
The effect of pollution is severe upon
Spicules made of silica are found in
Pollutant released by jet planes is
The plants differentiated from pollen grain grown in vitro condition are called
Middle piece of mammalian sperm possesses
Most common ovule, having close to the micropyle, is called
Enzyme of oxidative phosphorylation occur in
Colleterial gland is present in
Diffusion of carbon dioxide from the intestinal tissues to the mesenteric capillaries is called
Air pressure is reduced inside the thoracic cavity when
Energy for ATP synthesis is obtanined from
Stem modified into flattened photosynthetic structure is
Higher CO₂ concentation around to leaves results in
Increasing the levels of aldosterone in the blood would result in
increasing aldosterone means that more sodium ultimately winds up in the blood, activating thirst mechanisms which increases ECF(extracellular fluid) volume and therefore increases blood pressure. (if you raise blood volume, you raise blood pressure)
Inferior ovary with cypsella fruits are found in the family-
Chromophil cells present on pharynx of Earthworm take part in secretion of