Saved Bookmarks
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 58651. |
Amphoteric oxide |
|
Answer» Aise oxide jo acidic as well as basic behaviour so karte hai aur ..............acid aur base dono se react karte hai ........e.g. Alo Ex:Aluminium oxide and zinc oxide....These are the oxides which react with both acids and bases.... those metal oxide which are acidic as well as basic in nature are known as amphoteric oxide for example zinc oxide and Aluminium oxide.... |
|
| 58652. |
Name the functional group present in acetic acid.... |
|
Answer» COOH Carboxylic acid --- C=O-OH carboxylic acid COOH .. Carboxylic acid CooH |
|
| 58653. |
What is power of accommodation??? |
|
Answer» The ability or the property of the eye lens to adjust its focal length in order to be able to focus both near and distant objects is known as the power of accommodation. It is the ability of the eye lens to adjust its focal length in order to see distant as well as nearby objects clearly.... |
|
| 58654. |
Why planets don\'t twinkle?I want answer in easy language |
|
Answer» The planets are much closer to the earth, and are thus seen as extended sources. If we consider a planet as a collection of a large number of point-sized sources of light, the total variation in the amount of light entering our eye from all the individual point-sized sources will average out to zero, thereby nullifying the twinkling effect. Hence, the planets do not twinkle Ek planet ko cosider kr skte h as a collection of large no.of point sources of light....islie jo dimming effect thode bahut point source produce krte h us dimming effect ko baki point sources ka brighter effect nullify kr deta h.... islie planet ki overall brightness same rhti h and wo twinkle nahi krta...... Sater |
|
| 58655. |
What are barrier method |
| Answer» Barrier Method\tThis method involves putting up a barrier between the male and the female *** cells (sperms and ova). It blocks the sperms from reaching the ovary, thus preventing fertilization. The barrier method can be used by both men and women.\tWomen could use items like the contraceptive sponge, diaphragm, female condom, cervical shield or cervical cap to prevent the sperm reaching the egg.\tMale Birth Control through the barrier method involves the use of male condoms. | |
| 58656. |
Functioning of lens in human eye |
| Answer» It helps in converging the light rays on retina so that image can be formed on retina | |
| 58657. |
Five uses of concave mirror and convex mirror??? |
| Answer» ᴄᴏɴᴄᴀᴠᴇ ᴍɪʀʀᴏʀ–A Concave Mirror is that spherical mirror in which the reflection of light takes place at the concave surface.ᴜsᴇs ᴏғ ᴄᴏɴᴄᴀᴠᴇ ᴍɪʀʀᴏʀ–♦ Concave Mirrors are used as shaving mirror to see a large image of the face.♦ Concave Mirror are used by dentist to see a large image of the teeth of patients.♦ Concave Mirrors are used as reflectors in torches, Concave reflectors are also used in room heater.♦ Concave Mirror is used as doctors head mirror to focus light coming from the lamp on the body parts of a patient to examined by the doctor.♦ A large Concave Mirrors are used in the field of solar energy to focus sun rays for heating solar furnaces.ᴄᴏɴᴠᴇx ᴍɪʀʀᴏʀ–A Convex Mirror is that is spherical mirror in which the reflection of light takes place at the convex surface.ᴜsᴇs ᴏғ ᴄᴏɴᴠᴇx ᴍɪʀʀᴏʀ–♦ Convex Mirror are used as rear view mirror in vehicles to see the traffic at the rear side.♦ Convex Mirror are used in cars, trucks and buses.♦ A Convex Mirror always produces an erect image of the object.♦ Large Convex Mirrors are used as ‘shop security mirror’.♦ A Convex Mirror will produce a diminished image.\xa0 | |
| 58658. |
What is the funcition of mid brain |
|
Answer» The main function of mid brain is that it controls reflax movements. It controls the involountary actions of our body. For eg. heartbeat, respiration |
|
| 58659. |
Most reactive metal or non metal |
|
Answer» K is most reactive metal Lithium |
|
| 58660. |
Most reactive metal and non metal |
| Answer» Cs is the most reactive metal and fluorine is most reactive non-metal. | |
| 58661. |
Is the number of stomata same in the leaves of all plants? Explain. |
| Answer» No | |
| 58662. |
why dry HCl do not release H+ ions |
|
Answer» Because hcl require moisture to release h+ ions Because hcl is acid & it will only show its property in presence of H+ ions which are present in water HCL ionise in aqueous midium.Therefore dry HCL does not ionise to form H+ion. Bocoz it releases in aqueous solution |
|
| 58663. |
Can some one tell that theory comes for how many marks In Science board exams |
| Answer» 80 | |
| 58664. |
What is biodiversity hotspot????? |
|
Answer» Biodiversity is the various kinds of species of organisms and their range found in a particular area. Forests, wetlands, coral reefs, etc. have a rich biodiversity and are therefore considered as biodiversity hotspots.Forests are ‘biodiversity hotspots’. One measure of the biodiversity of an area is the number of species found there. ForesrBecauae vaeious organiams can be found there. Forests....are known as bio diversity hotspots.... |
|
| 58665. |
What is limitations of mendleves periodic tanle |
|
Answer» •Isotops should have different position.•Position of hydrogen is one of the failure Position of hydrogen and isotopes could not be explained Position of heavier element before lighter one can not be explined. °Similar elements are seprated. Ex- Pt,Au Table |
|
| 58666. |
Describe the principle and function of motor with its components |
|
Answer» Electric Motor\xa0operates on direct current obtained from a battery.\xa0Principle: An electric motor works on the principle that a current carrying conductor placed in a magnetic field experiences a force.\xa0\xa0\xa0Fig.\xa0An electric d.c.\xa0motorConstruction:\xa0An electric motor consists of the following main parts:1. Field magnet: It is a strong horse shoe type magnet with concave poles.2. Armature: It is a rectangular coil ABCD having a large number of turns of thin insulated copper wire wound over a soft iron core.\xa0The armature is placed between the poles of the field magnet and it can be rotated about an axis perpendicular to the magnetic field lines.\xa03. Split ring commutator: It consists of a cylindrical metal ring split into two halves S1and S2. The two ends A and D of the armature coil are connected to the split rings S1\xa0and S2\xa0respectively. As the coil rotates, the split rings also rotate about the same axis of rotation. The function of the split ring commutator is to reverse the direction of current in the coil after every half rotation.4. Brushes: Two graphite or flexible metal rods maintain a sliding contact with split rings S1\xa0and S2, alternately.5. Battery: A battery of few cells is connected to the brushes. The current from the battery flows to the armature coil through the brushes and the split rings.Working: Initially, suppose the plane of the coil is horizontal. The split ring S1\xa0touches the brush B1\xa0and split ring S2\xa0touches the brush B2. The current in coil flows in the direction ABCD from the source battery, as shown in Fig.(a).Clearly, the currents in arms AB and CD are in opposite directions. The force acting on arm AB pushes it downwards while the force acting on the arm CD pushes it upwards. Thus the armature coil alongwith the axle rotates anticlockwise. After half a rotation, as shown in Fig.(b), the\xa0split ring\xa0comes in contact with brush B2, and S2\xa0in contact with brush B1. Therefore, the current in the coil gets reversed and flows along the path DCBA. A device that reverses the direction of flow of current through a circuit is called commutator. Thus the arm AB is now pushed up and the arm CD is pushed down. Therefore, the coil and the axle rotate half a turn more in the same direction. The reversing of the current is repeated at each half rotation, giving rise to a continuous rotation of the coil and to the axle.Split ring acts as commutator in electric motors. Kon |
|
| 58667. |
Agla question....What is Tyndall effect...?? |
|
Answer» Particles flow in airIs called tynadall effect ?????? Scattering of light by a particle in its path is called tyndall effect.. Scattering of light by colloidal particles is known as.... |
|
| 58668. |
What is fleming left hand and right hand rule |
| Answer» The mid finger forefinger and thumb are placed perpendicular to each other... And as we know a comductor through qhich current is passing feels motion when placed in a magnetic field... So if the midfinger is in the direction of current and forefinger in the direction of field then the thumd points in the direction towards where the motion will take place | |
| 58669. |
Why pituatory gland is known as master endocrine gland?? |
|
Answer» The pituitary gland or the master gland controls the secretion of hormones from the other endocrine glands, including the thyroid, adrenal etc.*It secretes the hormones which induce gamete formation in the gonads, testes and ovaries.*It also secretes the growth hormone which plays an important role in the growth of adolescents\xa0*Main hormones secreted by pituitary gland include, Growth hormone, TSH, FSH, LH, ACTH, MSH, Vasopressin and Oxytocin.\xa0 earlier it was believed that pituatary gland is the master gland because it controlled the working of other glands and their secretion.... although later we discovered that it is hypothalamus of brain tht controls all our glands and their secretions including the pituatary gland..... |
|
| 58670. |
Two examples of double displacement precipitation reaction |
|
Answer» AgNO3 + NaCl----- AgCl + NaNO3 1.Bacl+naso4--baso4+nacl2.Pbi +kno3--pbno3+ki |
|
| 58671. |
What is spinal nerves |
| Answer» Those nerves which arise from spinal cord | |
| 58672. |
What is cranial nerves ? |
| Answer» Nerves which arise from the brain. | |
| 58673. |
What is peripheral nervous system? |
| Answer» It involves cranial nerves which arise from the brain and the spinal nerves which arise from the spinal chord. | |
| 58674. |
What is nerumuscular junction? explain with daigram |
| Answer» A neuromuscular junction (or myoneural junction) is a chemical synapse formed by the contact between a motor neuron and a muscle fiber. It is at the neuromuscular junction that a motor neuron is able to transmit a signal to the muscle fiber, causing muscle contraction. | |
| 58675. |
What is nuclear fusion and nuclear fission |
| Answer» Nuclear fission reaction involves the fusing of two or more lighter nuclei to form a heavier nucleus with the liberation of large amount of energy | |
| 58676. |
What do you know about fussion or fision ? |
| Answer» When 2 nuclei fuse with each other is known as fusionWhen single nucleus splits into2 more than 2 nuclei is known as fission | |
| 58677. |
Explain two ways to determine the age of fossils. |
|
Answer» 1 Carbon dating2 the fossils present in upper layers are recent and the fossils present in that are old fossils .. Relative methodCarbon dating |
|
| 58678. |
how to identify the electronic configuration |
| Answer» First 2 atoms in k shell than 8 and 8 and ... try to satisfy 2n^2 formulae | |
| 58679. |
One half of a convex lens is covered with black paper. Will the lens produce a complete image verify |
|
Answer» yes but it\'s intensity will also be halfed Yes Yess |
|
| 58680. |
What are and how are deseases transmitted while sexual reproduction |
| Answer» From the gene the diseases are transfer | |
| 58681. |
What are the methods of reducing population? |
| Answer» By using contracepation methods like1. Barrier method - using condoms2. Natural method - avoid copulation3. Chemcial method - using oral pills4. Surgerical method - vascetomy 5. Using IUCDs like Copper T | |
| 58682. |
A studebt |
| Answer» | |
| 58683. |
Law of refraction and reflection |
|
Answer» 2nd law of reflection is angle of incidence is equal to angle of reflection 1st law of reflection is , the incident ray , the normal and the reflected ray all lies in the same plane at the point of incidence 2nd law of refraction is the ratio of sin of angle of incidence to sin of angle of refraction is constant for a given pair of media. 1st law of refraction is , the incident ray , the normal and the refracted ray all lies in the same plane at the point of incidence. The laws of reflection of light. When a ray of light is incident on a mirror, it gets reflected in accordance with the following laws of reflection:\xa0First law: The incident ray, the reflected ray and the normal at the point of incidence all three, lie in the same plane.\xa0Second law: The angle of incidence (i) is equal to the angle of reflection (r).i.e., ∠i = ∠r.\xa0\xa0Fig.\xa0Reflection in a plane mirror\xa0\xa0\xa0\xa0Laws of refraction states that:(1) The incident ray, the refracted ray and the normal to the interface of two media at the point of incidence all lie in\xa0the same plane.(2) For the light of a given color and for\xa0given pair of media, the ratio of the sine of the angle of incidence to the sine of the angle of refraction is constant.This is also known as Snell\'s Law.Mathematically it can be written as:Here,\xa0\xa0is the refractive index of medium B with respect to medium A.Refractive index of a medium with respect to the vacuum is known as the absolute refractive index.c is the speed of light in vacuum and c is the speed of light in medium B. |
|
| 58684. |
What is a valve |
|
Answer» Valve is a tissue which prevent the back flow of blood There is a valve through which blood passes before leaving each chamber of the heart. The valves prevent the backward flow of blood. |
|
| 58685. |
What are the functions of neuron? |
|
Answer» Neurons are nerve cells which are the functional units of the nervous system. The three main parts of a neuron are dendrite, cell body and axon.Functioning of its three parts.Dendrite: It detect information and conducts the messages towards the cell body.Cell body: It contains nucleus, mitochondria, and other cell organelles. It maintains the growth of the cell.Axon: It conducts messages away from the cell body and pass to the next neuron.Hope it helps you..... Neuron helps in the transmission of signals from various parts of our body through nerves as nervous are made up of several neurons Draw the structure of a neuron and explain its function. \xa0Structure of a neuronFunction: Dendrites of a neuron collect information from the receptors and pass it to the cell body in the form of electrical impulse. From the cell body impulse passes along the axon to its end. At end of the axon, the electrical impulse results in the release of certain chemicals (chemical neurotransmitters). These chemicals cross the gap (synapse) between the endings of the axon and dendrites of the next neuron and start a similar electric impulse in the dendrites. Thus information received travels along the neurons of a nerve to the effector muscles or gland. On reaching to the desired muscle or gland, axon endings from Neuromuscular junction (synapse between axon endings and muscle cells) through which information delivered from neuron to muscles or glands. I will give answer after exam |
|
| 58686. |
What is neuro muscular junction |
|
Answer» A neuromuscular junction (or myoneural junction) is a chemical synapse formed by the contact between a motor neuron and a muscle fiber. It is at the neuromuscular junction that a motor neuron is able to transmit a signal to the muscle fiber, causing muscle contraction. The neuromuscular junction (NMJ) is the site of communication between motor nerve axons and muscle fibres. It is composed of four specialised cell types: motor neurons, Schwann cells, muscle fibres and the recently discovered kranocytes. the space between the muscle cells and the sensory neuron where the electric impulse is transferred frm the neuron to the muscle cell about the simulus |
|
| 58687. |
Explain flemish left hand right hand rule |
|
Answer» they are rules which tells about in which direction in motor current flow and where is force applied and on which side magnetic field is.......by using ur hands u can find it easily....jst remember thumb shows force..forefinger shows magnetic field and centre finger shows current Fleming’s left-hand rule gives the direction of magnetic force acting on a conductor whereas Fleming’s right-hand rule is used to find the direction of induced current.Fleming\'s left-hand rule is used to find\xa0the direction of magnetic force acting in an\xa0electric motors while Fleming\'s right-hand rule is used to find\xa0the direction of induced current in an\xa0electric generators.An electric current and magnet field exist in an electric motor, and they lead to the force that creates the motion , and so the left hand rule is used which gives the direction of magnetic force acting. In an electric generator, the motion (due to force) and magnetic field exist and they lead to the production of an electric current , and so the right hand rule is used which helps us to find the direction of induced current.Fleming’s right-hand rule :According to this rule, “Stretch the thumb, forefinger and middle finger of the right hand such that they are mutually perpendicular to each other. If the forefinger points indicates the direction of the magnetic field and the thumb indicates the direction of motion of the conductor, then the middle finger will indicate the direction of induced current in the conductor”.Fleming’s left-hand rule :According to this rule, “Stretch the thumb, forefinger and middle finger of the left hand such that they are mutually perpendicular to each other. If the forefinger points in the direction of magnetic field and the middle finger indicates the direction of the current, then the thumb will indicate the direction of motion or the force on the conductor”. |
|
| 58688. |
Most expected questions in section c |
|
Answer» Short notes on any three plant or animal hormone Balancing chemical equation Power of lens with a nomarical |
|
| 58689. |
Drawbacks of mendeleve\'s preodic law |
|
Answer» Drawbacks/Demerits of Mendeleev\'s periodic table :-1) Hydrogen\'s positionHydrogen resembled the properties of both alkali metals(like lithium) and also that of halogens(like iodine). Hence, the position of hydrogen(whether hydrogen is to be placed with halogens or alkali metals) was not specified.2) Position for IsotopesIsotopes are those with same atomic no: and different mass no:s.Mendeleev\'s\xa0periodic table was based on arranging elements in increasing order of atomic masses. But isotopes were not included in his periodic table.3) Certain elements were arranged in reverse order. Elements having higher atomic mass were placed in front(or before) the elements with less atomic mass. Example - Cobalt and NickelCobalt being more heavier than Nickel ,was placed before Nickel , in the Mendeleev\'s periodic table. He could not assigned correct position of hydrogen.Isotopes were discovered long time after his table.The atomic masses could not increase in regular manner |
|
| 58690. |
Why curd is not kept in cooper and brass vesel |
|
Answer» Because in curd latic acid is present and it will react with copper and brass. Because curd contain lactic acid and acid will react with metal ,i.e, copper and brass , to form salt |
|
| 58691. |
What is right auricle any left auricle |
| Answer» The right auricle receive non-oxygenated blood from upper and lower venae cavae and small veins in the thorax and direct it to the right ventricle.While the left auricle receive oxygenated blood coming from lungs through pulmonary veins and direct it to the left ventricle. | |
| 58692. |
Why ozne is not use for breathing? |
| Answer» Because it is a poisonous gas. At ground level there is no use of it. | |
| 58693. |
What is a crystallisation |
| Answer» The molcules of watrr are looking as dry but they are actually contains water molecules.this is known as water of crystlisation. | |
| 58694. |
Hey everyone!!! How your preparation of science is going on??? |
|
Answer» Hlo, preparation is almost done.? Yaa It means amazing Wow Like yours |
|
| 58695. |
Is variation and meiosis related to each other? |
| Answer» | |
| 58696. |
Osmatic pressure |
| Answer» the pressure that would have to be applied to a pure solvent to prevent it from passing into a given solution by osmosis, often used to express the concentration of the solution. | |
| 58697. |
Which figures may be come in boards |
|
Answer» most chance of flower..neuron and female fertilisation...inhe achi tra kr lijie heart ...neuron ...female fertilisation...flower pollination..nephron are the most imp Heat brain eyes motor generator stomatal pore.........etc......or most important alimentary canal and excretory system neuron and nephron ...... Ameoba, yeast , urinary system, reproductive system of male, female and flower, neuron, brain... Heart and eyes |
|
| 58698. |
natural selection and its ex...plz btayie |
|
Answer» Prani is correct ? Natural selection is the process in nature by which organisms better adapted to their environment tend to survive and reproduce more than those less adapted to their environment. For example, treefrogs are sometimes eaten by snakes and birds.This explains the distribution of Gray and Green Treefrogs. Hope it helps:-) |
|
| 58699. |
Is chp 9 very imp for tmrow exam plz tell me anyone |
|
Answer» From 9th A lot of thank you chetna I am also not able to understand that genetic drift,natural selection and mutation Its important |
|
| 58700. |
About solenoid |
| Answer» It is any matelliac matrial on which insulated copper wire is turned around. so when the current is on then the metal avt as a temproray magnet or eletro magnet | |