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A particle moves for 20 seconds with velocity 3 m/s, then moves with velocity 4 m/s for another 20 seconds, and finally moves with velocity 5 m/s for the next 20 seconds. What is the average velocity of the particle?
A block of ice of mass 10 kg slides down an inclined 5 m long and 3 m high. A man pushes up on the ice block parallel to the incline so that it slides down at a constant speed. The coefficient of friction between the ice and the incline is 0.1. Find the work done by the man on the block. (g = 10 m/s2)
Two blocks of masses 1 kg and 2 kg are connected by a metal wire going over a smooth pulley as shown. The breaking stress of the metal is
what should be the minimum radius of the wire used if it is not to break?
A drum of radius R full of liquid of density d is rotated at ω rad/s. The increase in pressure at the centre of the drum will be:
What is the self-inductance of an air-core solenoid of length 3.14 m and cross-sectional area 10–3 m2 with 500 turns?
If a current of 2 A flows through a coil, then the flux linked with the coil is 2 Weber. If the current through the coil changes at the rate of 1 A/s, then the EMF induced in the coil is
Which of the following figures represents the variation of particle momentum and associated de Broglie wavelength?
A car moving with a speed of 50 km/h can be stopped by brakes after at least 6 m. If the same car is moving at a speed of 100 km/h, the minimum stopping distance is
When three identical bulbs of 60 W, 200 V rating are connected in series to a 200 V supply, the power drawn by them will be
A string of length 'L' is fixed at one end and carries a mass 'M' at the other end. The string makes 2/π revolutions per second around the vertical axis through the fixed end as shown in the figure. The tension in the string is
A spring of force constant k is cut into two pieces such that one piece is double the length of the other. The force constant of the longer piece will be
The ratio of the velocity of sound in hydrogen (γ = 7/5) to that in helium (γ = 5/3) at the same temperature is
A particle of mass m carrying charge q is kept at rest in a uniform electric field E and then released. The kinetic energy gained by the particle, when it moves through a distance y, is
The magnetic field at a distance r from a long wire carrying current i is 0.4 T. The magnetic field at a distance 2r is
Charge through a cross-section of a conductor is given by Q = (3t2 + 2) C (where t is time in second). The average current through the conductor in the interval t = 1 s to t = 3 s will be
Mobility of free electron in a current carrying conductor is proportional to
A cantilever beam is loaded as shown below
T he deflect ion of the free end will be
A container having 1 mole1 mole of a gas at a temperature 27℃ has a movable piston which maintains at constant pressure in container of 1 atm1 atm. The gas is compressed until temperature becomes 127℃. The work done is
Beats are produced by two travelling waves each of loudness I and nearly equal frequencies n1 and n2. The beat frequency will be_______and maximum loudness heard will be________.
Each of these questions contain two statements, Assertion and Reason. Each of these questions also has four alternative choices, only one of which is the correct answer. You have to select one of the codes (a), (b), (c) and (d) given below.
Assertion: The position-time graph of a uniform motion, in one dimension of a body cannot have negative slope.
Reason: In one – dimensional motion the position does not reverse, so it cannot have a negative slope.
Match the units mentioned in List-I with the units in List-II.
A block of mass M lies at rest on a horizontal table.
Statement I: (Newton's 3rd Law) To every action, there is an equal and opposite reaction. Action and reaction forces act on different bodies and in opposite directions.
Statement II: The normal reaction is the reaction force, while the weight is the action.
The current through the 5 Ω resistance connected across AB as shown in the given circuit is
The equivalent resistance between A and B as shown in the given circuit is
A potential difference of 10 V is applied across a conductor of length 5 cm. If drift velocity of electron is 2 x 104 m/s, then electron mobility in (m2V-1s-1) will be
A galvanometer of resistance 50 Ω gives full scale deflection at 3 mA current. What should be value of shunt so that it can measure a current of 28 mA?
Five hundred cells of same emf E and same internal resistance r are connected in series to form a loop in same order (without external resistance). The potential drop across 199 cells is found to be
The power dissipated in 3 Ω resistance as shown in the circuit is
The resultant resistance value of three resistors each of r Ω are connected in series is x. When given three resistances are connected in parallel, the resultant value is
In a potentiometer experiment the balancing length of the cell was found to be 80 cm. Now, a resistance of 8 Ω is connected across the terminal of this cell the balancing length becomes 60 cm. The internal resistance of this cell is
A particle experiences constant acceleration for 20 s after starting from rest. If it travels a distance s1 in the first 10 seconds and distance s2 in the next 10 seconds, then
The following question has four choices, out of which ONLY ONE is correct.
The velocity-time (v-t) graph for a moving object is shown in the figure below. The total displacement of the object during the time interval, when there is non-zero acceleration and retardation, is
A river is flowing from West to East with a speed of 5 m/min. A man can swim in still water with a velocity of 10 m/min. In which direction should the man swim, so as to take the shortest possible path to go to South?
Which of the following is not a vector quantity?
The potential difference between points A and B as shown in the given circuit will be
A charged particle moves through a magnetic field perpendicular to its direction, then
When a 20 V m-1 electric field is produced inside a conductor and 4 x 104 A m-2 current density is established in it. Resistivity of the conductor is
The drift velocity of the electrons in a current carrying conductor is of the order of:
Kilowatt hour is the unit of
A simple potentiometer circuit is shown in the figure. The internal resistance of the 10 V battery is negligible, AB Is the uniform wire of resistance 4 Ω and length 100 cm. If deflection of the galvanometer is zero. Then length AB will be
Assertion: The average velocity of the object over an interval of time is either smaller than or equal to the average speed of the object over the same interval.
Reason: Velocity is a vector quantity and speed is a scalar quantity.
Match List-I with List-II:
Choose the correct answer from the options given below:
Statement I: (Newton's 1st Law of Motion) Every body continues in its state of rest or of uniform motion in a straight line except in so far as it be compelled by an externally impressed force to act otherwise.
Statement II: It is observed that when a car brakes suddenly, the passengers are thrown forward.
In Young's double slit experiment, if the distance between the slits and the screen is doubled and the separation between the slits is reduced to half, the fringe width
Select the incorrectly matched pair from the following:
The reduction potential at pH = 14 for the Cu2+/Cu couples is
Which of the following statements is false for the reaction H2 + Br2 → 2HBr?
The rate law is dx/dt = k[H2][Br2]½ .
An organic compound which produces a bluish-green coloured flame on heating in the presence of copper is
The alcohol manufactured from water gas is
Which of the following reagents converts both acetaldehyde and acetone to alkanes?
Match the enzymes given in Column I with the reactions they catalyse given in Column II.
Select the correct option.
Identify the correct set of stereochemical relationships amongst following monosaccharides l-IV.
Which of the following statements are incorrect?
Choose the incorrect match.
Among the following, maximum enolic content is shown by
Which one of the following complexes is expected to have the highest stability constant (K)?
The shape of NH3 molecule is
The molecule having the highest bond energy is
In the following question, two statements are given. One is assertion and the other is reason. Examine the statements carefully and mark the correct answer accordingly.
Assertion: σ bond is a strong bond, while π is a weak bond.
Reason: Atoms rotate freely around π bond.
In the following question, two statements are given. One is Assertion and the other is Reason. Examine the statements carefully and mark the correct answer according to the instructions given below.
Assertion: CCI4 and H2O are immiscible.
Reason: CCI4 is a polar solvent.
Which among the following species have square planar geometry around the central atom?
(i) XeF4
(ii) SF4
(iii) [NiCI4]2-
(iv) [PtCI4]2-
In the following question, two statements are given. One is assertion and the other is reason. Examine the statements carefully and mark the correct answer according to the instructions given below.
Assertion: Molecular nitrogen is less reactive than molecular oxygen.
Reason: The bond length of N2 is shorter than that of oxygen.
The type of hybrid orbitals used by iodine atom in hypoiodous acid molecule are
Which of the following is the atomic number of a metal?
Which of the following has the maximum ionisation potential?
Sodium forms Na+ ion, but it does not form Na2+ because of
Which of the following sets has the same number of unpaired electrons in their ground state?
Which of the following is the electronic configuration of a noble gas?
Assertion: The first ionisation energy (IE) of Be is greater than that of B.
Reason: 2p-orbitals have lower energy than 2s-orbitals.
For electron affinity of halogens, which of the following is correct?
Assertion: [AI(H2O)6]3+ is a stronger acid than [Mg(H2O)6]2+.
Reason: The size of [AI(H2O)6]3+ is smaller than [Mg(H2O)6]2+ and it possesses more effective nuclear charge.
The de-Broglie wavelength of the electron in the ground state of hydrogen atom is (KE = 13.6 eV and 1 eV = 1.602 × 10-19 J)
The de-Broglie wavelength associated with a particle of mass 10–6 kg moving with a velocity of 10 ms–1 is
Assertion: The atoms of different elements, having same mass number but different atomic numbers, are known as isobars.
Reason: The sum of protons and neutrons in isobars is always different.
The velocity of an electron in the second shell of the hydrogen atom is
Uranium 92U238 decays into a stable isotope of:
The quantum number 'm' of a free gaseous atom is associated with the
For the principle quantum number n = 4, the total number of orbitals having ℓ = 3 is
The most probable radius (in pm) for finding the electron in He+ is:
Which of the following sets of quantum numbers (n, l, m and ms, respectively) is not possible?
The end product C in the below reaction sequence is
In the mechanism of Hoffmann reaction, which intermediate rearranges to alkyl isocyanate?
Standard electrode potential of three metals X, Y and Z are –1.2 V, +0.5 V and –3.0 V, respectively. The reducing power of these metals will be
The IUPAC name of CH3COCH(CH3)2 is
Calculate the wavelength of light required to break the bond between two chlorine atoms in a chlorine molecule. The CI–CI bond energy is 243 kJ mol–1 (h = 6.6 × 10–34 Js; c = 3 × 108 ms–1, Avogadro's number = 6.023 × 1023 mole–1)
In the following question, two statements are given. One is Assertion, and the other is Reason. Examine the statements carefully and mark the correct answer according to the instructions given below.
Assertion: Only principal quantum number determines the energy of an electron in an orbital in Na atom.
Reason: For one electron system, the expression of energy is quite different as that obtained in Bohr's theory.
Which of the following pairs has the same percentage of carbon?
The stoichiometry of the reaction given below is
K2S2O8(aq) + 2KI(aq) → 2K2SO4(aq) + I2(aq)
Carbon and oxygen form two compounds. Carbon content in one of them is 42.9%, while in the other, it is 27.3%. The given data supports
Assertion (A): Gymnosperms have naked seeds.
Reason (R): In gymnosperms, the ovules and seeds are not enclosed by an ovary.
Which of the following is the most abundant chemical in the living organisms?
Read the following statements for the endomembrane system and state them as true (T) or false (F).
A. In the animal cells, lipid-like steroidal hormones are synthesized in SER.
B. The convex or trans face of the Golgi apparatus is a maturing face from which the lysosomes arise.
C. The membrane of lysosomes has an active H+ pump mechanism that maintains acidic pH in the lumen of the lysosomes.
D. The contractile vacuole of the Amoeba helps in osmoregulation and excretion.
The discipline of biology which deals with the kinds and diversity of all organisms and their evolutionary relationship is called:
In operon concept, regulator gene functions as:
Both Chlamydomonas and Chlorella are autotrophic and both have a cell wall, whereas both Paramoecium and Amoeba are heterotrophic and both lack cell wall, then why did R.H. Whittaker place all of them under the same kingdom?
The hormone which was discovered through “foolish seedling disease” of rice is
What is the food material in the members of class Rhodophyceae?
Respiration in plants is different from animals as
Glycolysis occurs
a. In all anaerobes
b. In mitochondrial matrix of eukaryotes and in cytoplasm of prokaryotes
c. With help of oxygen
Select the correct one(s).
How many ATP molecules are directly synthesised during glycolysis from one molecule of glucose?
A. Aerobic respiration takes place in the matrix as well as inner membrane of mitochondria.
B. Pyruvate is converted into acetyl CoA before entering into mitochondria.
Read the above statements and choose the correct option.
The first step of TCA cycle
a. Starts with condensation of acetyl group with OAA & water
b. Yields a five carbon product
c. Is catalysed by citrate synthase
Choose the correct one(s).
At which of the given step of TCA cycle CO2 is released along with reduction of NAD+?
Cells in the meristematic phase of growth shows/have
Match the columns and select the correct option.
All of the following can be oxidised to release energy during respiration, except
Choose the incorrect one for glycolysis.
Fermentation
Pyruvate dehydrogenase requires
Which one is a 5C intermediate of TCA cycle?
Which of the following phytohormones may involve in growth inhibiting as well as growth promoting activities?
Which phytohormone functions in stimulating fruit development with auxin?
Who out of the following gave the cladistic concept of species?
Classification given by Linnaeus was artificial because
Systematics is the study of:
Which of the following bond is present in proteins?
Which of the following is the odd one in context of wheat?
Binomial nomenclature is given by ____________
Which one of the following is the correct hierarchical system in ascending order?
Which of the following sentences is false about international code for botanical nomenclature?
In the light of recent classification of living organisms into three domains of life (bacteria, archaea and eukarya), which one of the following statement is true about archaea?
Which among the following statements are correct?
What initiates the formation of endosperms?
Sexual reproduction through fusion of gametes similar in size takes place in
What is an important reason for the conservation of natural resources?
Species which are morphologically similar but vary in reproductive features are known as
In the following question, the Assertions (A) and Reason (R) have been put forward. Read both the statements and choose the correct option from the following.
Assertion: Cycas is called as the ‘relic of past’.
Reason: Cycas exhibit phylogenetic relationship with pteridophytes.
Match the following columns.
Application of minute quantity of which of the following to leaves reduces transpiration to a great extent through partial closure of stomata?
What test is used to determine the sex of the fetus?
Conifers are adapted to tolerate extreme environmental conditions because of
Which of the following sentences is true about leafy stage in bryophytes?
In gymnosperms, the ovule is naked because
Which of the following pteridophytes belongs to the class Psilopsida?
Match column I with column II and select the correct option from the codes given below.
Select the set of correct statements:
a. In an aquatic ecosystem, the grazing food chain is a major conduit for energy flow.
b. Detritus food chain may be connected with the grazing food chain at some levels.
c. Each trophic level has a certain mass of living material at a particular time called standing state.
d. Species composition and stratification are two main structural features of an ecosystem.
Following are the steps of the catalytic cycle of enzyme action:-
i. Enzyme releases the product and is ready to bind to another molecule of the substrate.
ii. Binding of the substrate induces the enzyme to alter its shape, fitting more tightly around the substrate.
iii. The active site of the enzyme, now in close proximity of the substrate, breaks the chemical bonds of the substrate.
iv. The substrate bind to the active site of the enzyme.
Choose the correct sequence of the steps from the following.
In a population with an almost equal number of pre-reproductive and reproductive individuals and comparatively fewer post-reproductive individuals, the age pyramid will be
Which of the following hormone levels will cause release of ovum (ovulation) from the Graafian follicle?
Which one of the following statements in regard to the excretion by the human kidneys is correct?
Choose the incorrect statement from the following.
a. 12 pairs of ribs are present.
b. Ribs dorsally articulate with sternum and ventrally with the vertebral column.
c. Ribs are not bicephalic.
d. Ribs are attached with sternum with the help of hyaline cartilage.
Which of the following classes is incorrectly matched with its general characters?
All are correct with respect to the Human Genome Project, except
Read the following statements and select the incorrect ones.
(i) Circulatory system in arthropods is of closed type.
(ii) Parapodia in annelids help in swimming.
(iii) Phylum Mollusca is the second largest animal phylum.
(iv) Aschelminthes are dioecious.
Read the following sentences and select the correct option with all true statements.
a. During parturition, oxytocin induces intense contractions in the uterus.
b. After parturition oxytocin stimulates milk ejection.
c. The labour pain during childbirth is due to oxytocin.
d. Oxytocin secrete from placenta and ovary.
Study the following statements and select the incorrect ones.
(i) Physical removal of large and small particles through filtration and sedimentation is called primary sewage treatment.
(ii) Secondary sewage treatment is mainly a mechanical process.
(iii) Activated sludge sediment in a sewage treatment plant is a rich source of aerobic bacteria.
(iv) Biogas commonly called gobar gas is pure methane.
Which of the following describes reptiles but not birds?
Chondrichthyes, exhibit all of the following characters, except
Match the organisms given in column I with their characteristic feature in column II.
Choose the incorrect statement.
Select the incorrect statement from the following.
Which of the following factors do not favour the formation of oxyhaemoglobin?
Protonephridia are primarily concerned with ionic and fluid volume regulation i.e. osmoregulation. These are found in
a. Planaria
b. Some annelids and rotifers
c. Cephalochordates
Choose the correct option.
Which of the following functions is not related to ADH?
Hormone released into blood by posterior pituitary gland but synthesized by neurons of hypothalamus is
Assertion: Lipids are not strictly macromolecules.
Reason: Lipids are indeed small molecular weight but because of their association with membranes separate in the macromolecular fraction.
The function(s) of pacemaker in heart is to______
Under which of the following conditions will dissociation of oxyhaemoglobin occur?
In alveoli of lungs, the air at the site of gaseous exchange is separated from blood by
The trachea is prevented from collapsing due to the presence of
The maximum volume of air that can be released from the lungs by forceful expiration after deepest inspiration is called:
The maximum volume of air contained in the lungs by a full forced inhalation is called:
Which of the following statements is/are correct regarding larynx?
When you hold your breath, which of the following gas changes in blood would first lead to the urge to breathe?
Which of the following substances is/are found in blood but not in lymph?
Serum can be differentiated from plasma due to the absence of
What happens when type A blood is given to a person with type B blood?
Which of the following elements plays a crucial role in conversion of prothrombin to thrombin during clotting?
The heart of which of the following animals always gets filled with deoxygenated blood?
Which of the following features belong(s) to Ctenophora?
The nerve centres which control the body temperature and the urge for eating are contained in:
Ringworm in humans is caused by:
Ascaris is characterized by
All veins carry deoxygenated blood except
Which of the following options shows the correct labelling of marked parts?
Which one of the following acts as a physiological barrier to the entry of microorganisms in human body?
Which of the following maintain(s) the functions of male sex accessory ducts and glands?
The structure that lies at the upper junction of the labia minora and is sensitive to sexual stimulation is ______________.
Which of the following is the function of the bulbourethral glands in the male reproductive system?
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