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In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion(A): The Ozone layer present at the top of the stratosphere is very crucial for human survival.
Reason (R): Ozone layer prevents IR radiation.
Assertion (A): Electromagnetic radiation exerts pressure.
Reason (R): Electromagnetic waves carry momentum and energy.
Assertion (A): Dipole oscillation produces electromagnetic waves.
Reason (R): Accelerated charge produces electromagnetic waves.
Wavelength of visible Spectrum ranges from
The physical properties of electromagnetic waves are decided by their
Radioactive decay of the nucleus leads to the emission of
Weather forecasting uses
Oscillating circuits produce
Which one is not an electromagnetic wave?
The energy of the em waves is of the order of 15 keV. To which part of the spectrum does it belong?
Microwaves have wavelength in the range of
Electromagnetic Spectrum is
Infra red rays are used
A point object is kept in front of a plane mirror. The plane mirror is doing SHM of amplitude 2cm. The plane mirror moves along the x-axis and x-axis is normal to the mirror. The amplitude of the mirror is such that the object is always infront of the mirror. The amplitude of SHM of the image is
A watch shows the time as 3 : 25. What will be the time that appears when seen through a plane mirror ?
If a ray of light is incident on a plane mirror at an angle 60° from the mirror surface, then deviation produced by mirror is
When light is reflected from a mirror a change occurs in its
An object is initially at a distance of 100 cm from a plane mirror. If the mirror approaches the object at a speed of 5 cm/s. Then after 6 s the distance between the object and its image will be
Two mirrors are placed perpendicular to each other. A ray strikes the first mirror and after reflection from the first mirror it falls on the second mirror. The ray after reflection from second mirror will emerge
An object is placed at a distance u from a concave mirror and its real image is received on a screen placed at a distance of v from the mirror. If f is the focal length of the mirror, then the graph between 1/v versus 1/u is
An infinitely long rod lies along the axis of a concave mirror of focal length f. The near end of the rod is at a distance u > f from the mirror. Its image will have a length
In the following questions, A statement of Assertion(A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): According to Huygens theory no back-ward wavefront is possible.
Reason (R): Amplitude of secondary wavelets is proportional to (1+ cos q), where q is the angle between the ray at the point of consideration and direction of secondary wavelet.
Assertion (A): When a light wave travels from rarer to denser medium, its speed decreases. Due to this reduction of speed the energy carried by the light wave reduces.
Reason (R): Energy of the wave is proportional to the frequency.
Assertion (A): For best contrast between maxima and minima in the interference pattern of Young’s double slit experiment, the amplitudes of light waves emerging from the two sources should be equal.
Reason (R): For interference, the sources must be coherent.
The refractive index of glass is 1.5 which of the two colors red and violet travels slower in a glass prism?
Emission and absorption is best described by,
In a Young’s double-slit experiment, the slits are separated by 0.28 mm and the screen is placed 1.4 m away. The distance between the central bright fringe and the fourth bright fringe is measured to be 1.2 cm. Determine the wavelength of light used in the experiment
A beam of light has a wavelength of 650 nm in vacuum. What is the wavelength of these waves in the liquid whose index of refraction at this wavelength is 1.47?
A beam of light consisting of two wavelengths, 650nm and 520nm, is used to obtain interference fringes in a Young's double-slit experiment. Find the distance of the third bright fringe on the screen from the central maximum for wavelength 650nm.
Estimate the distance for which ray optics is good approximation for an aperture of 4 mm and wavelength 400 nm.
Cavitation is a special application property exhibited only by
The electromagnetic theory of light was developed by
A light ray is travelling between two media as given below. The angle of incidence on the boundary in all the cases is 30o. Identify the correct sequence of increasing order of angles of refraction.
(1) Air to water
(2) Water to glass
(3) Glass to water
(Refractive indices of glass and water are 3/2 and 4/3, respectively.)
A lens of focal length 50 cm forms an image of a distant object, which subtends an angle of 1 milliradian at the lens. What is the size of the image?
A telescope has an objective of focal length 200 cm and an eyepiece of focal length 5 cm. What is the magnification of the telescope?
A beam of light consisting of two wavelengths, 650 nm and 520 nm, is used to obtain interference fringes in a Young’s double-slit experiment. What is the least distance from the central maximum where the bright fringes due to both the wavelengths coincide?
In a double-slit experiment, the angular width of a fringe is found to be 0.2° on a screen 1 m away. The wavelength of light used is 6000 Å. What will be the angular width of a fringe, if the entire experimental arrangement is immersed in water? (Refractive index of water = 4/3)
A single-slit Fraunhofer diffraction pattern is formed with white light. For what wavelength of light does the third secondary maximum in the diffraction pattern coincide with the second secondary maximum in the pattern for red light of wavelength 6500 Å?
In a Young's double slit experiment, 12 fringes are observed to be formed in a certain region of the screen when light of wavelength 600 nm is used. If the light of wavelength 400 nm is used, the number of fringes observed in the same region of the screen will be
A single slit of width 'd' is illuminated by a violet light of wavelength 400 nm, and the width of the diffraction pattern is measured as 'y'. When half of the slit width is covered and illuminated by yellow light of wavelength 600 nm, the width of the diffraction pattern is
Diffraction pattern of a single slit consists of a central band, which is
Interference fringes were produced in Young's double slit experiment using light of wavelength 5000 Å. When a film of material 2.5 x 10-3 cm thickness was placed over one of the slits, the fringe pattern shifted by a distance equal to 20 fringe widths. Which of the following represents the refractive index of material of the film?
The figure shows a surface XY separating two transparent media; medium-1 and medium-2. The lines ab and cd represent wavefronts of the light wave travelling in medium-1 and incident on XY. The lines ef and gh represent wavefronts of the light wave in medum-2 after refraction. Compare the speeds of light in the two media.
Light of wavelength 600 nm illuminates a diffraction grating. The second-order maximum is at an angle of 39.5°. How many lines per millimetre does this grating have?
(sin 39.5° = 0.636)
Formal charge on each oxygen atom is
Which is/are correct a -bonding scheme?
In compound X, all bond angles are exactly 109° 28’, X is:
The most stable shape of ClF3 is shown by
Which of the following statements is correct regarding the structure of PCI5?
Correct decreasing order of dipole moment of CH3F, CH3CI and CH3Br is
Given for HCI and HI
Ratio of fraction of electric charge existing on each atom in HCI and HI is
PCIx F5 - x shows non-polar behaviour when x is
The BCI3 is a planar molecule whereas NCI3 is pyramidal, because
Bond order of (B— H) x and y bonds in diborane are respectively
A cell is prepared by dipping a chromium rod in 1M Cr2(SO4)3 solution and an iron rod in 1M FeSO4 solution. The standard reduction potentials of Chromium and Iron electrodes are -0.75 V and -0.45 V respectively. What will be the standard EMF of the cell?
The oxidation number of P in Ba(H2PO2)2, Ba(H2PO3)2 and Ba(H2PO4)2 are respectively
The oxidation half reaction for following reaction is
Fe2+(aq) + Cr2O72-(aq) → Fe3+ (aq) + Cr3+(aq)
Of the following reactions, only one is a redox reaction. Identify it
The oxidation states of sulphur in the anions follow the order
In a reaction, 2Ag + 2H2SO4 → Ag2SO4 + H2O + SO2, H2SO4 acts as:
Reduction never involves:
In the reaction, 4Fe + 3O2 → 4Fe3+ + 6O2– which of the following statements is incorrect?
In which of the following molecules octet rule is not followed?
Among the following the electron deficient compound is
The outer orbitals of C in ethene molecule can be considered to be hybridized to give three equivalent sp² orbitals. The total number of sigma (s) and pi (p) bonds in ethene molecule is
Which of the following is a linear molecule?
Which of the following will have the lowest boiling point?
Among the following the maximum covalent character is shown by the compound
An atom of an element A has three electrons in its outermost orbit and that of B has six electrons in its outermost orbit. The formula of the compound between these two will be
The bond length between hybridised carbon atom and other carbon atom is minimum in
Which of the following reactions is a decomposition redox reaction?
What is the change in oxidation number of carbon in the following reaction?
CH4(g) + 4Cl2(g) → CCl4(l) + 4HCl(g)
The correct option for a redox couple is:
Which of the following reactions are disproportionation reaction?
(a) 2Cu+ → Cu2+ + Cu0
(b) 3MnO42+ + 4H+ → 2MnO4- + MnO2 + 2H2O
(c) 2KMnO4 ⟶Δ K2MnO4 + MnO2 + O2
(d) 2MnO4- + 3Mn2+ + 2H2O → 5MnO2 + 4H⊕
Select the correct option from the following :
For the redox reaction,
MnO4– + C2O4 2– + H+ → Mn2+ + CO2 + H2O
The correct coefficients of the reactants for the balanced equation are
Alkaline medium inhibits the rusting of iron, because
On exposure to moist air, copper gains a green coat on its surface due to the formation of which one of the following compounds?
The species having pyramidal shape is
Which of the following statements is correct regarding the oxidation number of Oxygen?
I. The oxidation number of Oxygen in most compounds is -2.
II. When Oxygen is bonded to Fluorine in compounds like Oxygen difluoride and Dioxygen diflouride, the Oxygen is assigned an oxidation number of +2 and +2 respectively.
III. In peroxide, an Oxygen atom is assigned an oxidation number of -1 and in Superoxide, each oxygen atom is assigned an oxidation number of -1/2.
Which of the following processes does not involve either oxidation or reduction?
A standard reduction electrode potentials of four metals are A = -0.250 V, B = -0.140 V, C = -0.126 V, D = -0.402 V The metal that displaces A from its aqueous solution is:
Oxygen has an oxidation state of +2 in the compound
The reduction potential values of M, N and O are +2.46 V, -1.13 V, -3.13 V respectively. Which of the following orders is correct regarding their reducing property?
The number of moles of KMnO4 reduced by one mole of KI in alkaline medium is
What is known as Autooxidation?
Which of the following statements regarding sulphur is incorrect ?
The number of types of bonds between two carbon atoms in calcium carbide is
The oxidation process involves
Who coined the term "ecology"?
Selaginella and Salvinia are ______ Pteridophytes.
Match List-I with List-II and select the correct answer given below in the lists.
The most important function of an inflorescence is to:
Bryophytes are called amphibians of the plant kingdom because
Which of the following statement is the most appropriate for sickle cell anaemia?
Which of the following statement is false?
Observe the diagram and choose the correct answer.
Which of the following is not a product of the light reactions of photosynthesis?
The hormone which reduces transpiration rate by inducing stomatal closure is
First dicarboxylic acid formed during TCA cycle is
If both male and female flowers are present on the same plant, such as castor and maize
Find out the incorrect statement w.r.t. artificial hybridisation
Filiform apparatus is present in
If an angiospermic female plant is diploid and male plant is tetraploid, the ploidy of PEN and zygote respectively would be
Find out the correct statement w.r.t. ex- albuminous seeds
What is the ratio of round green and wrinked yellow seeds in F2 generation of Mendelian dihybrid cross?
Match column-l with column-ll and select the correct option.
In the following questions a statement of Assertion (A) is followed by a statement of reason (R). Mark the correct choice as:
Assertion: There is no difference between the terms taxon and categories.
Reason: Aves is a class that includes category bird.
Which of the following is not a component of a chloroplast?
______and ______ are the examples of C4 and C3 plants, respectively.
C4 plants are more efficient in photosynthesis than C3 plants due to:
Assertion: The generic name begins with capital letter while specific name begins with small letter.
Reason: Scientifically mango is written as Mangifera indica.
Given below are two statements:
Statement I: Mendel studied seven pairs of contrasting traits in pea plants and proposed the Laws of Inheritance.
Statement II: Seven characters examined by Mendel in his experiment on pea plants were seed shape and colour, flower colour, pod shape and colour, flower position and stem height.
In the light of the above statements, choose the correct answer from the options given below :
Which taxon out of the following aggregates to constitute a division in plants?
What is the correct order of taxonomic hierarchy from the lowest to the highest category?
Which factors influence a biotic community?
What does binomial nomenclature refer to?
Which of the following hormones promote cell division and are present in greater concentration in areas of rapid cell divisions, such as in fruits and seeds?
Which of the following process does not happen during the light reaction of photosynthesis?
Which taxonomic category is used to group related genera?
Which one of the following is the correct hierarchical system in ascending order?
What is the predictable and gradual change in the species composition of a given area called?
Two kingdoms constantly figured in all biological classifications are:
Cell wall is absent in which of the following organism?
Which of the following is an important characteristic of all communities?
Which one is exclusive characteristic of living organism?
Double fertilization is seen in _______
International Code of Biological Nomenclature is applied to
Which are the terms interchangeable?
Who included a different kingdom 'Monera' for the first time in his biological classification?
Which of the following is not one of the five kingdoms of R. H. Whittaker's classification system?
Who wrote the book “Species Plantarum”?
A free-living aerobic and non-photosynthetic nitrogen-fixing bacterium is:
Sometimes different authors give different names to one and the same species. In such a situation
The amount of air exchanged in breathing can be measured with a
During the urine formation, the function/s of tubular secretion is/are:
(A) Secretion of H+, K+ and ammonia
(B) Maintenance of ionic balance
(C) Acid-base balance of the body fluids
Identify the correct statement/statements.
Match the column:
How many animals in the list given below are triploblastic, bilaterally symmetrical and pseudocoelomate?
Ascaris, Fasciola, Ancylostoma, Taenia, Neries, Wuchereria, Pheretima
The hormone responsible for enhancement of the respiration rate of fruits thereby leading to its early ripening is ________
Observe the diagrams given below of pBR322 plasmid:
Presence of which of the following vectors in the host will help in the screening of transformants that can grow on ampicillin-containing medium but not on that containing tetracycline?
Menstruation is initiated by:
Which of the following is an incorrect statement?
Statement I: Autoimmune disorder is a condition where body defense mechanism recognizes its own cells as foreign bodies.
Statement II: Rheumatoid arthritis is a condition where body does not attack self cells. In the light of the above statements, choose the most appropriate answer from the options given below:
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): All vertebrates are chordates but all chordates are not vertebrates.
Reason (R): Notochord is replaced by vertebral column in the adult vertebrates.
In the light of the above statements, choose the most appropriate answer from the option given below:
Outer cortical part of cerebellum is formed by
Identify cranial meninx which is in direct contact with the brain tissue
During repolarisation, the neural membrane is
(A) Permeable for K+ ions for their efflux
(B) Impermeable for K+ ions
(C) Permeable for Na+ for their influx
(D) Impermeable for both Na+ and K+ ions
From above, select the option with only incorrect statement
What is the role of myelin sheath in nerve fibers?
During which phase of the cell cycle does DNA replication occur?
ADH, responsible for reabsorption of water and reduction in urine volume is synthesised by
The hormones that initiate ejection of milk, stimulates milk production and growth of ovarian follicle, are respectively
Equational division refers to
Which of the following types of disorder is transferred from a phenotypically normal, but carrier female to only some of the male progeny?
Which of the following statements is not correct regarding plasmids?
Which part of the nephron is responsible for the reabsorption of water and solutes from the filtrate?
Statement I: The release of sperms into the seminiferous tubules is called spermiation.
Statement II: Spermiogenesis is the process of formation of sperms from spermatogonia. In the light of the above statements, choose the most appropriate answer from the options given below:
Which of the following sexually transmitted diseases is not completely curable?
Development of secondary sexual characters in females are controlled by
Which one of the following is a matching set of phylum and its three examples?
Choose the odd one out based on coelom: Annelids, Molluscs, Platyhelminthes, Arthopods
The number of ATP molecules synthesised depends upon which of the following?
Secondary growth is due to _______
The covering outside an ovule in Gymnosperms is called as __________
Notochord is restricted in tail of:
Which of the following statements is correct?
Where is ciliated epithelium found in human body?
Which of the following cells are the most numerous in human body?
Which of the following proteins is present in the bone matrix?
What makes up more than one-half the volume of neural tissue in our body?
Lining of parotid gland consists of which type of cells?
Plasma proteins are made by the:
Which of the following blood components play a major role in blood coagulation?
Which of the following is incorrect about reproduction in Gymnosperms?
Muscular walls of ventricles are thicker than walls of atria because ventricles have to:
Ramesh has Rh antigen and Anti-A as well as Anti-B antibodies in his blood. During blood transfusion, he can receive blood from:
The middleman between blood and tissues is:
Which gland is often called the "master endocrine gland"?
Small oval-shaped structures found in the lymphatic vessels are termed:
Which hormone is known as the "stress hormone"?
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