Q 1 – The following reaction is an example of a
4NH3(g) + 5O2(g) → 4NO(g) + 4H2O (g)
- displacement reaction
- combination reaction
- redox reaction
- neutralisation reaction
(a) 1 and 4
(b) 2 and 3
(c) 1 and 3
(d) 3 and 4
(c) 1 and 3
Q 2 – N2 + 3H2 → 2NH3
With the reference of above reaction which one of the option in the table is correct?
| Reactants | Products |
(a) | N2, H2 | NH3 |
(b) | NH3 | N2, H2 |
(c) | N2 | H2NH3 |
(d) | N2NH3 | H2 |
Q 3 – In following diagram the parts A, B and C are sequentially.
(a) cotyledon, Plumule and radical
(b) Plumule,radical and cotyledon,
(c) Plumule, cotyledon and radical
(d) radicle cotyledon,and Plumule,
(c) Plumule, cotyledon and radical
Q 4 – The reproductive life of a woman lasts from hacreemn to spauoemen
(a) reproductive life a woman lasts from menarche to menopause.
(b) reproductive life a woman lasts from menarche to menopause.
(c) reproductive life a woman lasts from chenmare to pausemeno.
(d) reproductive life a woman lasts from chenmare to usemenopa.
Menarcha is the first occurrence of menstruation and marks the beginning of the reproductive period.
Menopause is the end of menstruation and marks the end of the reproductive period of women.
Q 5 – Which of the following statements about transmission of nerve impulse is incorrect ?
(a) Nerve impulse travels from dendritic end towards axonal end.
(b) At the dendritic end electrical impulses bring about the release of some chemicals which generate an electrical impulse at the axonal end of another neuron.
(c) The chemicals released from the axonal end of one neuron cross the synapse and generate a similar electrical impulse in a dendrite of another neuron
(d) A neuron transmits electrical impulses not only to another neuron but also to muscle and gland cells.
(b) At the dendritic end electrical impulses bring about the release of some chemicals which generate an electrical impulse at the axonal end of another neuron.
Q 6 – In the arrangement shown in Figure, there are two coils wound on a non-conducting cylindrical rod. Initially the key is not inserted. Then the key is inserted and later removed. Then
(a) the deflection in the galvanometer remains zero throughout
(b) there is a momentary deflection in the galvanometer but it dies out shortly and there is no effect when the key is removed
(c) there are momentary galvanometer deflections that die out shortly; the deflections are in the same direction.
(d) there are momentary galvanometer deflection that die out shortly; the deflections are in opposite directions
(c) there are momentary galvanometer deflections that die out shortly; the deflections are in the same direction.
Q 7 – A cell, a resistor, a key and ammeter are arranged as shown in the circuit diagrams of Figure. The current recorded in the ammeter will be
(a) maximum in (i)
(b) maximum in (ii)
(c) maximum in (iii)
(d) the same in all the cases
(d) the same in all the cases
Q 8 – A uniform magnetic field exists in the plane of paper pointing from left to right as shown in Figure. In the field an electron and a proton move as shown. The electron and the proton experience.
(a) forces both pointing into the plane of paper
(b) forces both pointing out of the plane of paper
(c) forces pointing into the plane of paper and out of the plane of paper, respectively
(d) force pointing opposite and along the direction of the uniform magnetic field respectively.
(a) forces both pointing into the plane of paper
Q 9 – Equal volumes of hydrochloric acid and sodium hydroxide solutions of same concentration are mixed and the pH of the resulting solution is checked with a pH paper. What would be the color obtained?
(a) Red
(b) Yellow
(c) Yellowish green
(d) Blue
(c) Yellowish green
Q 10 – For the start of respiration, a living cell requires?
(a) Glucose
(b) Glucose + O2
(c) O2
(d) Glucose + ATP
(d) Glucose + ATP
Q 11 – Which of the following is not a straight chain hydrocarbon ?
Q 12 – The schematic diagram is given below :
Which of the following is an incorrect statement?
(a) A and E are chemically same
(b) A and D are chemically same
(c) D and E are chemically same
(d) C and E are chemically same
(b) A and D are chemically same
Q 13 – What happens when dilute hydrochloric acid is added to iron fillings as shown in the figure?
(a) Hydrogen gas and iron chloride are produced.
(b) Chlorine gas and iron hydroxide are produced.
(c) No reaction takes place
(d) Iron salt and water are produced.
(a) Hydrogen gas and iron chloride are produced.
Q 14 – Which of the following statement is not correct about the magnetic field?
(a) Magnetic field lines form a continuous closed curve.
(b) Magnetic field line do not interest each other.
(c) Direction of tangent at any point on the magnetic field line curve gives the direction of magnetic field at that point.
(d) Outside the magnet, magnetic field lines go from South to North pole of the magnet
d) Outside the magnet, magnetic field lines go from South to North pole of the magnet
Q 15 – Which of the following is the structural formula of ethyne ?
Q 16 – Assertion: Corrosion of iron is a serious problem.
Reason: Every year an enormous amount of money is spent to replace damaged iron.
(a) Both Assertion and Reason are True and Reason is the correct explanation of the Assertion.
(b) Both Assertion and Reason are True but Reason is not the Correct explanation of the Assertion.
(c) Assertion is True but the Reason is False.
(d) Both Assertion and Reason are False.
(b) Both Assertion and Reason are True but Reason is not the Correct explanation of the Assertion.
Q 17 – Assertion: Chromosomes are known as hereditary vehicles.
Reason: The chromosomes are capable of self-reproduction and maintaining morphological and physiological
properties through successive generations.
(a) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
(b) Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
(c) Assertion (A) is true but reason (R) is false.
(d) Assertion (A) is false but reason (R) is true.
(a) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
Q 18 – Assertion: When water is added to calcium oxide, a large amount of heat is produced.
Reason: It is an endothermic reaction.
(a) Both Assertion and Reason are True and Reason is the correct explanation of the Assertion.
(b) Both Assertion and Reason are True but Reason is not the Correct explanation of the Assertion.
(c) Assertion is True but the Reason is False.
(d) Both Assertion and Reason are False.
(b) Both Assertion and Reason are True but Reason is not the Correct explanation of the Assertion.
Q 19 – Assertion: In plants, water is transported through phloem.
Reason: It is because sieve tubes are absent in phloem.
(a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
(b) Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
(c) Assertion is true but Reason is false.
(d) Both Assertion and Reason are false.
(d) Both Assertion and reason are false.
Q 20 – A metal is treated with dil H2SO4 , the gas evolved is collected by the method shown in the figure. Answer the following :
(i) Name the gas.
(ii) Name the method of collection of the gas.
or
List any two observations when a highly reactive metal is dropped in water.
1) Hydrogen
2) Collected in an inverted test tube
or
(i) Large amount of heat is evolved.
(ii) Gas released catches fire
Q 21 – (a) What will happen to the guard cells and stomatal pore when water flows to guard cells ?
(b) How do plants transmit informations from cell to cell ?
(a) Guard cells control the opening land closing of stomata. … when water flows into the guard cells from the neighbouring epidermal cells they swell i.e. become turgid and become curved and cause the opening of stomatal pore . when the guard cells lose water they shrink become straight and cause the closure of stomatal pore.
(b) Plants have specific mechanisms to exchange information between cells. Long-distance transport occurs via the two conductive tissues, xylem and phloem, whereas for short-range movement of molecules plants use apoplastic/transcellular and symplastic pathways.
Q 22 – Which is the largest digestive gland present in human body ? What is the name and function of its secretion?
Largest digestive gland in human body is liver. It secrets bile juice. Bile juice helps in the emulsification of fats.
Q 23 – Urine passed during summer is usually less in quantity and is some what thicker. Why is it so ?
Or
What will happen to the garbage and dead animals and plants in absence of microorganisms ?
Due to more perspiration in summer there is more water loss from our body.
Or
The plants would not get essential nutrients, dead matter and waste would pile up.
Q 24 – A star appears on the horizon. What is the true position of the star ? Explain with the help of a diagram
Due to atmospheric refraction, the stars seem to be higher in the sky than they actually are. This can be explained as follows : Light from a star is refracted (bent) as it leaves space (a vacuum) and enters the earth’s atmosphere. Air higher up in the sky is rarer but that nearer the earth’s surface is denser. So, as the light from a star comes down, the dense air bends the light more. Due to this refraction of star’s light, the star appears to be at a higher position. For example, in figure, through the actual position of a star is at A, but due to atmospheric refraction, it seems higher in the sky at position B (This is because our eye will see the star at that position from where light enters it in the straight line direction). Our nearest star, the sun, also seems higher than it actually is, due to atmospheric refraction.
Q 25 – What is meant by near point and far point of an eye? State their values of the normal human eye.
The minimum distance of the object from the eye, which can be seen distinctly without strain is called the near point of the eye is. For a normal person’s eye, this distance is 25 cm. The far point of the eye is the maximum distance to which the eye can see objects clearly.
Q 26 – Manju is uses a concave mirror for image formation for different positions of an object. What inferences can be drawn about the following when an object is placed at a distance of 10 cm from the pole of a concave mirror of focal length 15 cm ?
(a) Position of the image
(b) Size of the image
(c) Nature of the image
Draw a labelled ray diagram to justify your inferences.
Given,
focal length,f = – 15 cm
object distance,u = –10cm
Image distance,v = ?
By using the image formula
So,
v= 30cm
By using the formula for the magnification of the image
We have
Q 27 – Study the picture carefully and answer the following:
(a) What does diagram given below depict?
(b) What are A and B ?
(c) Which vessel carried deoxygenated blood to lungs and which vessel brings oxygenated blood from lungs to heart ?
Double circulation.
(b) A – Pulmonary circulation
B – Systemic circulation.
(c) Pulmonary arteries, Pulmonary venis
Q 28 – (a) A non-metal X exists in two different forms Y and Z . Y is the hardest natural substance whereas Z is a good conductor of electricity. Identify X , Y , Z .
(b) An element X on reaction with oxygen forms an oxide XO2 . The oxide when dissolved in water turns blue litmus red. State whether element X is a metal or non-metal.
(c) Name the metal which is alloyed with copper to make bronze
(a) X is Carbon.
Y and Z are allotropes of carbon.
Y (hardest natural substance) – Diamond.
Z (Good conductor of electricity)
(b) X is non metal.
X + O2 → XO2
e.g., C + O2 → CO2
It turns blue litmus red.
(c) Tin.
Q 29 – Write one function of each of the following components of the transport system in human beings.
(a) Blood vessels
(b) Lymph
(c) Heart
or
(a) In the process of respiration, state the function of alveoli.
(b) Rate of breathing in aquatic, organisms is much faster tan that in terrestrial organisms. Give reasons.
(c) Complete the following pathway showing the breakdown of glucose :
a) Blood vessels – Carry blood for transportation from part of the body to other.
(b) Blood platelets – Helps in blood clotting during injury.
(c) Lymph – Carries digested and absorbed fat for transportation.
(d) Heart – It is a pumping machine which pumps blood to reach all the parts of the body.
Or
(a) Function of Alveoil:
(i) Gaseous exchange takes place in alveoli in the lungs.
(ii) Alveoil Provide a large surface area for the exchange of gases
(b) Rate of breathing in aquatic organism is much in the terrestrial organisms.
Terrestrial organisms breathe the oxygen in the atmosphere , but animals that live in water (aquatic organisms) use the oxygen dissolved in Water. Since the Amount of dissolved oxygen is very low as compared to amount of oxygen in the air (21%). So, the rate of breathing in aquatic organisms is much faster than that in terrestrial organisms.
(c)
Q 30 – Pawan is connected a galvanometer with a coil of insulated copper wire .What would happen if a bar magnet is :
(i) Pushed into the coil ?
(ii) Withdrawn from inside the coil ?
(iii) Held stationary inside the coil ?
(i) Due to Change in magnitude flux linked with coil, the Galvanometer shows deflection (say towards right).
(ii) Due to Change in magnetic flux Linked with coil, the galvanometer shows deflection [say towards left opposite to that in case (i)]
(iii) As it is stationary, no change in magnetic flux linked with coil, so galvanometer shows no deflection.
Q 31 – You are given two identical looking iron bars. Just using these two bars how will you identify whether any or both of these bars is/are a magnet ?
or
How does small intestine tissues help the digestion of fats, protein and starch?
Take a magnet and bring it near both the metal bars one by one. The bar which either attracts or repels the magnet is itself a magnetic bar while the other is not.
or
HCl contain Proteose enzyme which break and convert Protein into pep tones and peptides and carbohydrate is converted by enzyme into maltose and fat is converted into glycerol and fatty acid
Q 32 – Explain some harmful effects of agricultural practices on the environment.
or
An organic compound A is widely used as a preservative in pickles and has a molecular formula C2H 4O2. This compound reacts with ethanol to form a sweet smelling compound B.
Harmful effects of agricultural practices:
- Soil: Fertilizer affects the chemistry of the soil while also killing numerous beneficial bacteria.
- Groundwater: Fertilizer always leaches into the soil and eventually reaches groundwater.
It enhances the salinity of the groundwater. - Eutrophication:Fertilizer-sprayed fields runoff enters aquatic bodies.
Eutrophication occurs as a result of this. - Pesticides:Pesticides sprayed on crops make their way into bodies of water, harming the biota. Biomagnification causes persistent chemicals to become very hazardous to higher organisms.
- Groundwater: In most regions, continued use of groundwater in agriculture has resulted in a drop in the water table.
- Irrigation: It causes soils to get waterlogged and salivate.
- Genetic Erosion: The use of only a few high-yielding cultivars has resulted in agricultural plant genetic erosion.
- Detriment to the environment: Natural ecosystems and habitats have been harmed as a result of agricultural land removal.
- Climate Change: Farming supports monoculture by allowing a small number of species to be produced on a big tract of land. This has an impact on the area’s biodiversity.
- Deforestation: Forests are still being cut down to make space for agriculture. This resulted in a decrease in habitat for the majority of species.
- Soil Degradation:When land is farmed for a long time, the soil becomes inefficient in absorbing all of the nutrients. Soil deterioration occurs as a result of this. In addition, the use of hazardous pesticides and fertilizers causes soil deterioration.
- Pollution: Agriculture uses artificial fertilizers and pesticides, which pollute the environment. Soil, water, and air pollution are all caused by these pollutants.
Q 33 – (a) What is variation? How is variation created in a population? How does the creation of variation in a species promote survival?
(b) Explain how, offspring and parents of organisms reproducing sexually have the same number of chromosomes.
(i) The difference in the characters among individuals of a species is called variation.
A basic event in reproduction is the creation of a DNA copy. Cells use chemical reactions to build copies of their DNA. The DNA in the cell nucleus is the information sources for making proteins. If the infromation is changed, different proteins will be made. Different proteins will eventually lead to altered body designs. This causes of variations among the population.
(ii) The great advantage of variation to a species is that it increases the chances of its survival in a changing environment. For example, the accumulation of heat resistant variation in some bacteria will ensure itws survival even when the temperature in its enviroment rises too much due to heat wave. On the other hand, the bacteia which did not have variation to withstand heat would not survive.
(b) In sexual reproduction , organisums produce gametes through a special type of division, meiosis- reductional division, in which the original number of chromo-somes becomes half. These two gemetes then combine to form teh zygote and original number of chromosomes is restored as in the case of humen beings.
Q 34 – Refining is the process of purification of metals. One of the important method of refining is electrolysis. In electrolysis, electrical energy is used to bring about a non-spontaneous redox reaction. This is done by passing an electric current through a liquid containing ions, known as an electrolyte. In contrast to metals, the current
in electrolytes is carried by the movement of ions rather than the movement of electrons. The solid conductors inserted into the liquid are called electrodes, the one with a positive charge is called the anode (because it attracts anions) and the one with the negative charge is called the cathode.
A diagrammatic representation of electrolysis of copper is shown below :
(i) Name the electrolyte used in refining of copper.
(ii)
Which of these two reactions occur at cathode and anode?
Or
(iii) What is anode mud ? Name two metals which can be refined by electrolytic method.
(i) Acidified copper sulfate
(ii) (a) Reaction a. occurs at anode.
(b) Reaction b. occurs at cathode.
Or
(ii) The impurities which settle at the bottom of anode.
A result of electrolysis is called anode mud. Nickel and zinc.
Q 35 – A concave mirror forms image of an object thrice in its size on a screen. Magnification of a mirror gives information about the size of the image relative to the object. It is defined as the ratio of size of image to the size of object. It is represented by m.
Sign of magnification by mirror gives the information about the nature of the image produce by it.
(i) Describe the nature of image formed.
(ii) If the object x distance from the pole of mirror, then find image distance from the pole.
(iii) If the radius of curvature of mirror is R, then write the relation between object distance, image distance and focal length of the mirror.
(iv) Give one use of concave mirror.
Q 36 – The growing size of the human population is a cause of concern for all people. The rate of birth and death in a given population will determine its size. Reproduction is the process by which organisms increase their population.
The process of sexual maturation for reproduction is gradual and takes place while general body growth is still going on. Some degree of sexual maturation does not necessarily mean that the mind or body is ready for sexual acts or for having and bringing up children. Various contraceptive devices are being used by human beings to control the size of population.
(i) List two common signs of sexual maturation in boys and girls.
(ii) What is the result of reckless female foeticide ?
(iii) Which contraceptive method changes the hormonal balance of the body ?
(i) Common signs of sexual maturation in boys and girls are :
(a) Thick hair growing in new parts of the body such as armpits and the genital area between the things. Thinner hair can also appear on legs and arms, as well as on the face.
(b) The skin frequently becomes oily and might begin to develop pimples.
(ii) Due to reckless female foeticide, child sex ratio is declining at an alarming rate in some sections of the society.
(iii) Contraceptive pills changes the hormonal balance of the body.