Telangana 10th Class Imp Questions

Q. What is the role of Acid in stomach?
A. Hydrochloric acid which is produced in the stomach kills the germs in our food and it also neutralizes the food which is alkaline in
nature.
Q. What is the reason that litmus paper placed on the tongue changes its colour?
A. Saliva in the mouth contains alkaline character. So red litmus paper is changed into blue colour.
Q. How can you say that carbohydrates are not digested in stomach?
A. No enzymes are produced in stomach which can digest carbohydrates. So I can say that carbohydrates are not digested in stomach.
Q. Imagine that what changes are done when the air passes through nasal cavities in inspiration?
A. Air is filtered in nasal cavities by mucous lining and the hairs growing from its sides remove tiny particles of dust. Air temperature
is brought close to that of body.
Q. What is the main reason for feeling pain in muscles after strenuous exercises?
A. Due to anaerobic respiration in muscles, large amount of lactic acid is accumulated and this results in muscular pains.
Q. “If there are no algae, there will be no fishes in the sea”. How do you justify?
A. Algae produce Oxygen as a result of photosynthesis. This Oxygen is utilized by the fishes in the sea for respiration. If there is no oxygen fishes may die.
Q. Ramayya travelled from Hyderabad to Vijayawada in bus throughout the night. What changes can we observe in his legs? What do we call this stage?
A. The supply of nutrients to the cells the liquid portion of the blood with nutrients flows out of the capillaries. Hence it is clearly seen
that his lower part of the legs are swollen. This stage is called edema.
Q. What do we call the natural movements of the protoplasm?
A. Brownian movements.
Q. Imagine what happens if waste materials are not sent out of the body from time to time?
A. The body becomes poisonous and death in organisms takes place.
Q. What are the main parts in Nephron that makes urine?
A. Bowman’s capsule and tubule.
Q. Write any two uses of Tannins.
A. Tannins are used in tanning of leathers and in medicines.
. When does kidney transplantation take place? From whom kidney is obtained?
A. Kidney transplantation is a permanent solution for renal failure patients. It is obtained preferably from close relative.
Q. When plants are exposed to external stimuli, they respond. What do we call this type of response?
A. Nastic movements.
Q. How does anger occur? What is its effect?
A. Increased levels of Adrenalin are responsible for anger. Anger persists for longer period of time, regular metabolic activities are
disturbed.
Q. In which method thousands of plants can be grown in a very short interval of time?
A. Tissue Culture.
Q. Is it necessary for the replication of DNA in interphase of the cell division? Why?
A. Yes it is necessary for the replication of DNA. After few cell divisions all the chromosomes will disappear from the cell.
Q. What are Chorion, Amnion and Allantois?
A. These are the membranes that cover the embryo.
Q. What are the organ systems involved in digestion of food which we eat?
A. Digestive system, muscular system, nervous system, endocrine system, circulatory system, skeletal system and excretory system.
Q. Endocrine system also involved in the process of digestion. What are the hormones secreted in digestive system?
A. 1. Ghrelin and leptin regulates hunger.
2. Secretin and cholecystokinin stimulates pancreas and liver.
Q. The dental formula of human is 2/2, 1/1, 2/2, 3/3.
a) How many incisors present in his mouth?
b) How many tearing teeth are present in his mouth?
A. a) 8 b) 4
Q. What is the usual range of pH of our mouth? And after eating?
A. Usual range is below 7 − Acidic in nature.
After eating it is beyond 7 − Alkaline nature.
Q. Write the phenotype and genotype ratios by observing the following matrix.
A. Phenotype ratio = 3 : 1
Genotype ratio = 1 : 2 : 1
Q. When a flood comes short paddy plants are died but long paddy plants are survived. What do we call this effect?
A. Sometimes accidents change frequency of genes in small populations. This is known as Genetic drift.
Q. Archaeopteryx is recognized as connecting link between aves and reptiles. Why?
A. Archaeopteryx has some avian characters and some reptilian characters. Hence it is called so.
Q. What is pyramid of Biomass?
A. A graphical representation designed to show the quantity of living matter at each tropic level in a given ecosystem is called “pyramid
of biomass”.
Q. What is sustainable development?
A. When we use the environment in ways that ensure we have resources for the future, it is called sustainable development.
Q. “Man is called moving museum”. How do you support it?
A. There are nearly 180 vestigial organs like appendix in human beings. Hence he is called so.
Q. Is there any reason for the intestine to be coiled with many folds? In what way it is useful during the process of digestion?
A. 1. It slows down the passage of the food along the intestine.
2. It also increases the surface area to absorb more nutrients and water.
Q. Why KOH is used in Moll’s half leaf experiment?
A. To absorb carbon dioxide present in the glass jar.
Q. Grass → Rabbit → Snake → Eagle. Name the producers and Secondary consumer in the above food chain.
A. Producer – Grass
Secondary consumer – Snake.

SET – I:
1. The refractive index of glass with respect to air is 2. Then the critical angle of glass – air interface is ……..
a) 0° b) 45° c) 30° d) 60°
2. When a light ray travels from a rarer medium (air) to a denser medium (glass) and if the angle of incidence is i and angle of refraction is r, then …….
a) i > r b) i < r c) i = r d) None of the above 3. ...... reflection does not obey the laws of reflection. a) regular b) irregular c) partial d) plane 4. The unit of refractive index is ...... a) m/s b) cm/s c) No units d) None of the above 5. Kerosene is optically ....... than water. a) diluted b) denser c) heavier d) rarer 6. The refractive index of benzene is ....... a) 0.15 b) 1.5 c) 1.33 d) 0.133 7. Optical fibres work on the principle of ....... a) reflection b) refraction c) internal reflection d) total internal reflection 8. The refractive index of air increases with.... a) hotness b) humidity c) density d) All the above 9. The incident and emergent rays in the case of glass slab are ........ a) perpendicular b) inclined c) parallel d) coincident 10. Mirage is an example of ..... a) reflection b) refraction c) optical illusion d) optical magic 11. Which one of the materials cannot be used to make a lens? a) water b) glass c) plastic d) clay 12. If f = + 0.5 m for a lens, then its power is ...... a) 0.5 dioptre b) 5 dioptre c) +2 dioptre d) + 1 dioptre 13. We can see ....... image with our eyes. a) virtual b) real c) inverted d) magnified 14. In the case of a concave lens, the image is always formed at ....... a) F b) between F and C c) beyond C d) between P and F 15. A stick held obliquely in water appears bent and short. This is due to the phenomenon of ...... a) reflection b) refraction c) scattering d) dispersion 16. A piece of transparent optical material, having one or two spherical surfaces is called ..... a) prism b) slab c) lens d) None of the above 17. The focal length of a lens depends upon ...... a) size of the object b) surrounding medium c) distance of the object d) nature of the object 18. Rays passing through the focus of a convex lens will take a path ....... to the principal axis after refraction. a) parallel b) perpendicular c) inclined d) None of the above 19. The mid point of a lens is called ..... a) centre of curvature b) focus c) optic centre d) principal axis 20. The value of the focal length of a lens is equal to the value of the image distance when the rays are ........ a) passing through the optic centre b) parallel to the principal axis c) passing through the focus d) in all cases 21. The value of least distance of distinct vision is ...... a) 10 cm b) 15 cm c) 20 cm d) 25 cm 22. During refraction ...... will not change. a) wavelength b) frequency c) speed of light d) All the above 23. When objects at different distances are seen by the eye which of the following remain constant? a) focal length of eye-lens b) object distance from eye-lens c) the radii of curvature of eye-lens d) image distance from eye-lens 24. Near sightedness is called ..... a) Myopia b) Hypermetropia c) Presbyopia d) All the above 25. This colour of light has longest wavelength in the visible spectrum of light ...... a) orange b) red c) violet d) yellow 26. This is the coloured part we see in the eye....... a) pupil b) cornea c) eye-lens d) iris 27. If the power of the lens is 2D, then its focal length is ...... a) 100 cm b) 50 cm c) 25 cm d) 75 cm 28. On a hot day the sky appears ....... a) Red b) Yellow c) White d) Blue Answers : 1-c 2-a 29-b 4-c 5-b 6-b 7-d 8-c 9-c 10-c 11-d 12-c 13-a 14-d 15-b 16-c 17-b 18-a 19-c 20-d 21-d 22-b 23-d 24-a 25-b 26-d. 27-b 28-c. SET - II: 1. The scientist who introduced elliptical orbit ...... a) Bohr b) Zeeman c) Sommerfeld d) Schrodinger 2. If l = 1 for an atom, the number of orbitals in its sub-shell is ..... a) 1 b) 2 c) 3 d) 0 3. The reciprocal of resistivity is ...... a) conduction b) conductivity c) resistance d) potential difference 4. No two electrons will have all the four quantum numbers same. This is known as ...... a) Aufbau Principle b) Hund's rule c) Pauli exclusion principle d) Amper's rule 5. The relation between wavelength (λ) ..... frequency (υ) ...... and speed (c) is ...... a) c = υ λ b) υ = c λ c) λ =cυ d) c = υ+λ 6. The lowest energy state of the electron is known as ........ a) ground state b) unknown state c) excited state d) all the above 7. 'd' orbitals shape is .......... a) spherical b) dumb bell c) double dumb bell d) cylindrical 8. Electrons are assigned to orbitals in order of increasing value of .............. a) n b) l c) (n + l) d) nl 9. Which of the following is the most active metal? a) Lithium b) Sodium c) Potassium d) Rubidium 10. At the time of Robert Boyle number of elements known are ........ a) 63 b) 115 c) 91 d) 13 11. Eka-Aluminium was later found to be ..... a) Aluminium b) Scandium c) Germanium d) Gallium 12. Modern Periodic table has .......... a) 7 periods, 18 groups b) 18 periods, 7 groups c) 8 groups, 8 periods d) 18 periods, 8 groups 13. Both lanthanides and actinides are ....... a) d-block elements b) s-block elements c) f-block elements d) p-block elements 14. Given R1 = 100 Ω and R2 = 1 Ω the effective resistance when these are connected in parallel ........... a) 0.99 Ω b) 9.9 Ω c) 0.909 Ω d) 101 Ω 15. Group 14 (IV A) family is called ........... a) Oxygen family b) Nitrogen Family c) Carbon Family d) Boron family 17. Which of the following elements is electronegative? a) Sodium b) Oxygen c) Magnesium d) Calcium 18. No electron gain or loss from this atom .... a) Sulphur b) Hydrogen c) Neon d) Nitrogen 19. The coordination number of Na+ ion in NaCl is ............. a) 6 b) 8 c) 5 d) 3 20. Unit of specific resistance ....... a) ohm b) meter c) ohm-meter d) ohm/ meter 21. Joule / Coulomb is the same as ....... a) 1-watt b) 1-volt c) 1-ampere d) 1-ohm 22. 18th group elements are ....... a) Metals b) Non-metals c) Metalloids d) Gases Answers : 1-c 2-c 3-b 4-c 5-a 6-a 7-c 8-c 9-d 10-d 11-d 12-a 13-c 14-a 15-c 16-b 17-b 18-c 19-a 20-c 21-b 22-d. SET - III: 1. Which converts mechanical energy into electrical energy? a) Motor b) Battery c) Generator d) Switch 2. Scientist who discovered the Laws of electromagnetic induction? a) Maxwell b) Planck c) Newton d) Faraday 3. 1 Tesla = a) Weber / meter b) Weber / (meters)2 c) Weber.meter d) Weber.meter2 4. Magnetic field lines are ....... a) Real lines b) Imaginary lines c) Geometric lines d) Induction lines 5. Right hand rule is applicable to ...... charge only a) Positive b) Negative c) Neutral d) None 6. Hydrocarbons that contain -OH group are called a) Alkanes b) Esters c) Alcohols d) Aldehydes 7. This is used as 'lead' in pencil a) Carbon b) Graphite c) Lampblack d) Coke 8. The magnetic field lines in a solenoid are a) closed loops b) open loops c) mixed loops d) intersecting loops 9. The most abundant metal in the earth's crust is ...... a) Silver b) Aluminium c) Zinc d) Iron 10. The oil used in froth flotation process..... a) Kerosene oil b) Pine oil c) Coconut oil d) Olive oil 11. Thermite reaction is a ....... reaction. a) Endothermic b) Exothermic c) Reverse d) Physical 12. CaO + SiO2 → ............ a) CaSiO b) CaSi + O3 c) CaO3 + Si d) CaSiO3 13. Stainless steel is a mixture of a) Iron + Nickel + Chromium b) Iron + Carbon c) Iron + Carbon + Nickel d) Iron + Chromium 14. This is a method of improving the properties of a metal..... a) Refining b) Reduction c) Alloying d) Roasting 15. 24 Carat gold is very ....... a) hard b) brittle c) soft d) hard and brittle 16. Which of the following solution of acetic acid in water can be used as preservative? a) 5 -10% b) 10 -15% c) 15 - 20% d) 100% 17. The hardest material is known as a) Petroleum coke b) Diamond c) Wood charcol d) Buck minister fullerene Answers : 1-c 2-d 3-b 4-b 5-a 6-c 18-b 8-a 9-b 10-b 11-b 12-d 13-a 14-c 15-c 16-a 17-b.