MAHESH TUTORIALS SECTION - A

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1 S.S.C. MAHESH TUTORIALS Test - II Batch : SB Marks : 30 Date : SCIENCE Chapter :,, 4, 6, 0, Time : hr. 5 min. SECTION - A Q.I (A) Rewrite the following statements by choosing the correct option : The least distance of distinct vision is about.... (a) 30 cm (b) 35 cm (c) 0 cm (d) 5 cm (ii) Electric current is measured with the help of a device called.... (a) an ammeter (b) a volt meter (c) a thermometer (d) a calorimeter Q.I (B) Rewrite the Column II so as to match the Column I : Column I Column II Helium (a) Halogen (ii) Chlorine (b) Alkaline earth metal (iii) Hydrogen (c) H (iv) Magnesium (d) Noble gas Q.I (C) State whether the following statements are True or False : Resistance in series arrangement is used to decrease resistance of (ii) In an atom of an element, extra-nuclear electrons take part in the chemical. reaction. Q.II Answer the following as required : (Any Two) Distinguish between Resistance in series and parallel. (ii) Give two names of the following :. Member of nd period. Metalloid. (iii) State the modern periodic law. Q.III Solve the following : Calculate the focal length of a corrective lens having power.5 D. 4 Q.IV (ii) Draw a neat and labelled diagram : (Any One) A ray diagram for object position beyond F for a convex lens. A ray diagram for object position at F for a convex lens.

2 S.S.C. MAHESH TUTORIALS Test - II Batch : SB Marks : 30 SCIENCE Chapter :,, 4, 6, 0, Date : MODEL ANSWER PAPER Time : hr. 5 min. SECTION - A A.I (A) Rewrite the following statements by choosing the correct option : The least distance of distinct vision is about 5 cm. (ii) Electric current is measured with the help of a device called an ammeter. A.I (B) Rewrite the Column II so as to match the Column I : Column I Column II Helium Noble gas (ii) Chlorine Halogen (iii) Hydrogen H (iv) Magnesium Alkaline earth metal A.I (C) State whether the following statements are True or False : False. Resistance in series arrangement is used to increase resistance of (ii) True. A.II Answer the following as required : (Any Two) Resistance in series and parallel. Resistance in series. Resistances are connected one after another such that the current flowing through its resistance is the same.. This combination increases the effective resistance in the 3. This combination decreases the current in the circuit 4. The effective resistance in series is equal to the sum of the individual resistors. Resistance in parallel.. Resistances are connected between two common points such that the potential difference across each resistance is the same.. This combination decreases the effective resistance in the 3. This combination increases the current in the 4. The reciprocal of effective resistance in parallel is equal to the sum of reciprocals of the individual resistance.

3 (ii) A ray diagram for object position at F for a convex lens. A B F F O F F Image position : At infinity. Nature : Real, inverted and highly magnified. A.V Answer the following : (Any One) V C D R R R 3 A K E. Let R, R and R 3 be three resistances connected in series between C and D.. Let R S be the effective resistance in circuit and V, V and V 3 be the potential difference across R, R and R 3 respectively. 3. Let the potential difference across CD be V. 4. In series combination. V = V V V 3... By using Ohm s law V = IR S V = IR, V = IR and V 3 = IR 3 Substituting these values in equation we get IR S = IR IR IR 3 R S = R R R 3

4 (ii). In the mouth, the food is crushed and wetted with saliva secreted by the salivary glands so the food can smoothly pass through the soft lining of the alimentary canal.. The food that we take is of complex nature. 3. It is converted into simpler molecules with the help of biological catalysts called as enzymes. 4. Enzyme salivary amylase breaks down starch into a simple sugar maltose. 5. Thus digestion of food starts in the mouth itself. (iii). Arteries carry blood from the heart to the various part of body.. They have to tolerate the force exerted by the blood which is under high pressure exerted by the heart. 3. Therefore the walls of the arteries are thick and elastic to avoid their rupture due to the force exerted by the blood. A.II (B) Answer the following : (Any Three) Physical change Chemical change. Water turns into ice. Bending of iron nail. Rusting of iron. Ripening of mango 3. Formation of compound 4. Decaying of vegetables (ii). Fats and edible oil when allowed to stand for a longer time in iron or tin container becomes rancid.. The condition produced by oxidation of fats and oils in food marked by unpleasant smell and taste is called rancidity. When the oil is heated, it starts frothing and smells foul. 3. If the food is cooked in rancid oil, it gives an unpleasant smell and taste, making it unfit for consumption. So, edible oil is not allowed to stand for a long time in an iron or tin container. (iii) When silver nitrate solution reacts with sodium chloride solution it gives a white precipitate of silver chloride and sodium nitrate. This reaction is a double displacement reaction. AgNO 3(aq) NaCl (aq) AgCl NaNO 3(aq) Silver nitrate Sodium chloride Silver chloride Sodium nitrate (iv). Liver, the largest gland in the body secretes bile juice which is stored in the gall bladder.. Whenever food enters the small intestine, the gall bladder releases bile into it through a duct.

5 (ii) Vertical section of a kidney. Kidney Renal artery Renal vein Ureter Kidney medulla (iii) Human excretory system. Renal artery Kidney Renal vein Ureter Urinary bladder Urethra A.IV Answer the following : (Any One) Basic steps of nutrition in animals :. Ingestion : The act of taking food inside.. Digestion : The process of breaking down of complex organic food into simpler soluble substances. This is done mechanically by teeth and chemically with the help of enzymes. 3

MAHESH TUTORIALS SECTION - A

MAHESH TUTORIALS SECTION - A S.S.C. MAHESH TUTORIALS Test - I Batch : SB Marks : 0 Date : SCIENCE Chapter :,, 4, 6, 0, Time : hr. SECTION - A Q.I (A) Rewrite the following statements by choosing the correct option : (i) The centre