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STD- 10th

Subject- SCIENCE Marks = 80

Date : 4/10/2014 Time= 3hr.

SECTION - I

Q.1 A) a) Fill in the blanks : (3 Marks)

i) The formula of chloride of metal M is MCl2 . the metal M belongs to.group.

ii) The chemical formula of POP is

iii) The chemical reactions in which H2(g)is lost is termed as ...b) State whether the following statements are True or False. (2 Marks)

i) Magnetic lines of force always cross each other.

ii) Voltmeter is always connected in series with the device.

B) Rewrite the following statements by selecting the correct options. (5 Marks)

i) At the time of short circuit, the current in the circuit .

A) Increases B) Decreases C) Remains same D) increase in steps

ii) Phenolphthalein istype of indicator

A) natural B) universal C) synthetic D) olfactory

iii) The device used for producing current is called..

A)

Voltmeter B) Ammeter C) Galvanometer D) Generator

iv)Heat (H) =.

A) IR B) RA/l C) I2Rt / 4.18 D) V/ R

v) In modern periodic table symbol Z denoted by .

A) Atomic number B) Atomic Mass C) Electron D) Atomic Radius

Q.2. Answer any five of the following. (10 Marks)

1) Atomic size increases by the group. Give scientific reason.

2) Find the resistance of the conductor if 0.28vcurrent is passing through it and potential

difference of 22v is applied across it.3) Name the three elements having a single electron in their outermost shell.

4) Distinguish between AC and DC.

5) Explain term Water of crystallization. Give example.

6) What do you understand by the term Redox Reaction ?

Q.3 Answer any five of the following. (15 Marks)

1) Distinguish between the Endothermic and Exothermic.

2) Which are safety measures in using electricity? Explain.

3) What are the merits and demerits of Mendeleevs periodic table ?

4) What is resistivity of a conductor? Derive the necessary formula for resistivity of a conductor.What is SI unit for resistivity?

5) If the two resistances are connected in series, the total resistance is 45 and the same

resistance is connected in parallel the total resistance become 10 . find the value of individual

resistance?

6) Explain detail in hydronium ion?

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Q.4 Any One (5 Marks)

1) We feel fresh while on a morning walk in natural surrounding why dont we feel the same

after 10 a.m and during rush hours? Write a chemical reaction to support your statement.

2) Explain the construction working of Electric motor with diagram.

SECTION - II

Q.5 A) a) Name the following : (3 Marks)i) An alloy of copper and zinc.

ii) Cells that assist the neurons in their function.

iii) Maintain the steady state by different system in an organism.

b) Correct the following statements (2 Marks)

i) In human beings the blood goes to the heart in one cycle once.

ii) Plasma is called the tissue fluid.

B) Given below are the end products of different reactions involving glucose (5 Marks)

Write the reaction number in front of the following

1) Anaerobic reaction

2)

Reaction in human muscles

3) Aerobic respiration

4) Reaction in plant cells

5) Reaction in liver

Q.6. Answer any five of the following. (10 Marks)

1) Calcium floats over water during the reaction with water. Give scientific reason.

2) Write down the properties of Organic compound containing covalent bond.

3) Translocation is needed in all higher plants. Give scientific reason

4) Draw a labeled diagram of Neuromuscular junction.5) Explain term Reflex Action.

6) Give the IUPUC name CH3-CH=CH-CH3

Q.7. Answer any five of the following. (15 Marks)

1) Distinguish between the saturated and unsaturated hydrocarbons.

2) Explain phototropic movement and chemotropic movement.

3) What happen when aluminum ore is heated with concentrated caustic soda . Write the

balanced chemical equation for the same.

4) Metal A has electronic configuration of 2, 8, 1 and Metal B has 2,8,8,2 which is more reactive.

Identifies these metals and give their reaction with dil HCl.5) Explain CNS.

6) Write the properties of ethanoic acid (acetic acid) and write the balance reaction with

halogens.

Q.8. Any One (5 Marks)

1) Explain the human digested system in detail with neat diagram.

2) State and explain how alkanes are further classified.

GLUCOSE

1. Starch

5. CO2+Ethanol

4. Lactic Acid

2.Glycogen

3. CO2+ H2O