August 2022
CLASS X (H.P.) SUBJECT- SCIENCE
TERM - 1
Time Allowed: 3 Hours]. [Maximum Marks: 50
Instructions:
1. Question Nos. from 1 to 20 are compulsory and Multiple Choice Type Questions. Each
question carries 1 mark.
. 2. Question Nos. from 21 to 28 are of 2 marks each.
3. Question Nos. from 29 to 31 are of 3 marks each.
4. Question No. 32 is of 5 marks.
5. In some questions internal choice is given.
6. Wherever possible draw diagrams and label them also.
1. Which of the following is not an example of a biomass energy
(a) Wood
(c) Nuclear energy
(b) Gobar gas
(d) Coal.
2. The xylem in plants are responsible for:
(a) Carrying water (c) Carrying amino acids 3. At the time of short circuit, the current in the circuit.
(b) Carrying food (d) Carrying oxygen.
(a) Reduces substantially (c) Increases heavily
(b) Does not change
4. A shiny brown coloured element 'X' on heating in air becomes black in colour. Name the element 'X' and the black coloured compound formed. 5. Which of the following correctly describes the magnetic field near a long wire ? The
field consists of:
(a) Straight lines perpendicular to the wire. (b) Straight lines parallel to the wire.
(c) Radial lines originating from the wire. (d) Concentric circles centered on the wire
(d) Vary continuously
6. In which cell organelle is chlorophyll found?
(a) Mitochondria
(b) Nucleus
(c) Chloroplast
(d) All of the above.
7. What is the respiratory pigment in humans? (a) Phytochrome
(c) Hemoglobin
(b) Cytochrome (d) None of the above
8. Which one of the following enzymes is found in pancreatic juice ?
(a) Amylase (c) Pepsin
(b) Sucrose (d) Trypsin
9. In the process of aerobic respiration, complex molecules are converted into simple
molecules
(a) In the presence of oxygen (c) Both (a) and (b)
(b) In the absence of oxygen
(d) None of the above. A 10. CaCO3(s)CO(s)+ CO2 (g), this reaction is:
(a) Combination
(b) Decomposition (d), Double displacement.
(c) Displacement
11. Tartaric acid is found in:
(a) Orange (c) Tamarind
(b) Tomato
(d) Sour milk.
12.
The device used for producing electric current is known as: (a) Voltmeter
(b) Galvanometer
(c) Generator
(d) Ammeter.
13The resistivity of a conductor:
(a) Increases with increase in its area of cross-section (b) Increases with increase in its length
(e) Decreases with increase in its length
(d) Does not depend upon its length or area of cross-section.
14. (a) Combination
MnO,+ 4HCI- MnCl,+ 2H2O + Cl₂, this reaction is:
(c) Redox
15. Acetic acid is found in (a) Ant sting
(d) Displacement.
(b) Nettle stings
(c) Lemon
(d) Vinegar.
16. The formula of "Rust" is:
Fe2O3. b). Fe(OH)3 c) Fe3O4 d) Fe2O3.xH2O
Following question have two statements. Answer the given question by selecting the appropriate option.
17. Assertion (A): Strength of an electromagnet can be increased by increasing the number
of turns per unit length in solenoid coil. Reason (R): Strength of an electromagnet can be increased by increasing the current
flowing through the solenoid. (a) A is true but R is false
(c) Both A and R are true
(b) R is true but A is false
(d) Both A and R are false.
18. Assertion (A): Mixing concentrated acids with water is a highly exothermic process.
Reason (R): Acids and bases neutralise each other to form corresponding salts and water.
(a) Assertion A is true but R is false
(b) Assertion R is true but A is false
(c) Assertion A and R both are true (d) Assertion A and R both are false.
19. Assertion (A): The sex of the children will be determined by chromosome received from the father.
Reason (R): A human male has one X and one Y chromosome.
(a) Assertion 'A' is true but (c) Both 'A' and 'R' are true
'R' is false (b) 'R' is true but "A" is false (d) Both 'A' and 'R' are false.
20. Assertion (A): The slurry left behind in a biogas plant is used as a manure.
Reason (R): Slurry contains methane and phosphorus as two main nutrients in it. (a) 'A' is true but 'R' is false
(c) 'A' and ^ prime R ^ prime both are true
(b) 'R' is true but : A ^ * is false (d) `` A " and 'R' both are false.
Two (2) Marks Questions
21. Why is it that very small amount of heat is produced in connecting wires whereas large
amount of heat is produced in heating filament of electric bulbs ?
22. How are water and minerals transported in plants ?
23. Why do HCI, HNO,, etc., show acidic characters in aqueous solutions while solutions of compounds like alcohol and glucose do not show acidic character ?
24. What are analogous organs? Explain with examples. 25. 3 ml of Sodium sulphate is mixed with 3 ml of Barium chloride (BaCl,) in a test tube
(a) Name the insoluble white coloured substance
(b) Name the chemical process, for the formation of this substance.
26. When does an electric short circuit occur?
27. Name two energy sources that you would consider to be renewable. Give reasons for your choice.
28. When is, the force experienced by a current carrying conductor placed in a magnetic field, the largest?
Three (3) Marks Questions
29. Why are we looking at alternative sources of energy?
30. State the rule to determine the direction of a:
(a) Magnetic field produced around a straight conductor-carrying current.
(b) Force experienced by a current-carrying straight conductor placed in a magnetic field which is perpendicular to it, and
(c) Current induced in a coil due to its rotation in a magnetic field.
Or
What precautions should be taken to avoid the overloading of domestic electric circuits? 31. (a) What is rusting of iron.
(b) State two ways to prevent rusting of iron.
32. The generation of heat in a conductor is an inevitable consequence of electric current. In
many cases, it is undesirable, because it changes/converts electrical energy into heat energy.
It is called Joule's Heating.
(a) Can this heating effect be useful for you? Classify by giving example. 2
(b) Give a use of Joule's Heating in your homes. 1
Or
……………..is a piece of such metal or alloy, which has appropriate melting point. It is safety device in your household electric circuits.
(c) Which metal is used for making the filaments of electric bulb and why ? 1+1=2
