MAHESH TUTORIALS SECTION - A

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1 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 of the spherical mirror is called.... (a) pole (b) centre of curvature (c) principal axis (d) focus Elements showing properties of both metals and non-metals are called as.... (a) metals (b) noble elements (c) non metal (d) metalloids Q.I (B) Rewrite the Column II so as to match the Column I : Column I Column II (i) Electric current (a) Joule Electric charge (b) Ampere (iii) Electric resistance (c) Ohm (iv) Potential difference (d) Coulomb (e) Volt Q.I (C) State whether the following statements are True or False : (i) Silver and copper are good conductors. Mendeleev arranged 63 elements in the periodic table. Q.II (A) Give scientific reasons : (Any One) (i) Connecting wires in a circuit is made of copper and aluminium. Concave mirrors are used in solar devices. Q.II (B) Answer the following as required : (Any Two) (i) If you are given a part of hollow spherical glass, how will you convert it into concave mirror? Draw a ray diagram for object between F and C for a concave mirror. (iii) State the Dobereiner s triads law. 4

2 SECTION - B Q.I (A) Fill in the blanks : (i) Products are represented on.... Carbondioxide enters into the leaves through tiny pores present on the surface of the leaf called.... Q.I (B) State whether the following statements are True or False : (i) Motor neurons conduct impulses from effector organs like muscles and glands to brain and spinal cord. Mucus protects the inner lining of the stomach from the action of acids. Q.II (A) Give scientific reasons : (Any One) (i) Physical states of reactants and products are mentioned while writing a chemical equation. Rate of breathing is faster in aquatic animals. Q.II (B) Answer the following : (Any Two) (i) What is tropic movement? Describe the different types of tropic movements. Classify the following into physical change and chemical change :. Rusting of iron. Water turns into ice 3. Ripening of mango 6. Magnetisation of iron nail. (iii) What happens to the food in the mouth? (iv) Describe the basic steps of nutrition in all animals. 4 Q.III (i) (iii) Draw a neat and labelled diagram of the following: (Any One) Human digestive system. Pancreas with their associated structures. Neuron. Best Of Luck

3 S.S.C. MAHESH TUTORIALS Test - I Batch : SB SCIENCE Chapter :,, 4, 6, 0, Marks : 0 Date : MODEL ANSWER PAPER Time : hr. SECTION - A A.I (A) Rewrite the following statements by choosing the correct option : (i) The centre of the spherical mirror is called pole. Elements showing properties of both metals and non-metals are called as metalloids. A.I (B) Rewrite the Column II so as to match the Column I : Column I Column II (i) Electric current Ampere Electric charge Coulomb (iii) Electric resistance Ohm (iv) Potential difference Volt A.I (C) State whether the following statements are True or False : (i) True. True. A.II (A) Give scientific reasons : (Any One) (i). Copper and aluminium are good conductors of electricity.. They have low electrical resistance. 3. As they are malleable and ductile they can be drawn into thin wires. Hence connecting wires in a circuit is made of copper or aluminium.. Solar devices like solar cooker or solar water heater uses solar energy to cook food or heat water.. When Sun ray falls on the concave mirror, they converge. 3. Due to convergence the intensity of Sun rays increases and the food or water is heated faster. Hence concave mirrors are used in solar devices.

4 A.II (B) Answer the following as required : (Any Two) (i) The inner side of the hollow spherical glass is concave, hence the outer side should be coated with reflecting layer to make inner side concave mirror. A ray diagram for object between F and C for a concave mirror. A B' C B F P A' Image position : Beyond centre of curvature. Nature : Real, inverted and magnified. (iii) He arranged chemically similar elements in the increasing order of their atomic weights in a group of three which is known as Dobereiner s triads. In a Triad, atomic mass of the middle element is approximately equal to the mean of atomic masses of other two elements in that triad. SECTION - B A.I (A) Fill in the blanks : (i) Products are represented on right hand side. Carbondioxide enters into the leaves through tiny pores present on the surface of the leaf called stomata. A.I (B) State whether the following statements are True or False : (i) False. Motor neurons conduct impulses from brain and spinal cord to effector organs. True. A.II (A) Give scientific reasons : (Any One) (i). The equation that gives more information about the chemical reaction is known as more informative or information giving equation.

5 The chemical equation can be made more informative in three ways : (a) By indicating the physical states of reactants and products. (b) By indicating the heat changes taking place in the equation. (c) By indicating the conditions under which the reaction takes place. So, physical states of reactants and products are mentioned while writing a chemical equation.. An animal living in water uses oxygen dissolved in water.. The solubility of oxygen in water is much lower. 3. So, the amount of oxygen available is much lesser than air. 4. Hence the rate of breathing is faster in aquatic animals. A.II (B) Answer the following : (Any Two) (i) The movement or growth of any part of a plant in response to an external stimulus is called tropism or tropic movement. Tropic movements are of three types :. Phototropic movement (Phototropism) : The movement of a plant in response to the stimulus of light is called phototropism. E.g. the shoot system of any plant responds towards the stimulus of light i.e. it grows in the direction of source of light.. Gravitropic movement (Gravitropism) : The root system of the plants responds to the stimulus of gravity. This movement is called as gravitropic movement. *3. Hydrotropic movement (Hydrotropism) : The root system of the plants responds to the stimulus of water. This movement is called hydrotropic movement. 4. Chemotropic movement (Chemotropism) : It is the movement of a plant part in response to certain chemicals. E.g. the growth of pollen tube towards the ovules. Physical change Chemical change. Water turns into ice. Rusting of iron. Magnetisation of iron nail. Ripening of mango (iii). The alimentary canal begins with the mouth.. A variety of food items have to pass through the digestive tract. So, the food is processed in the mouth to generate particles with small size. 3. Such crushed food is wetted with saliva secreted by the salivary glands so the food can smoothly pass through the soft lining of the alimentary canal.

6 The food that we take is of complex nature. It is converted into simpler molecules with the help of biological catalysts called as enzymes. Enzyme salivary amylase breaks down starch into a simple sugar maltose. Thus digestion starts in the mouth itself. (iv) 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. Absorption : After digestion is completed soluble digested food is absorbed into the blood. 4. Assimilation : The absorbed food is transported into tissues and cells of the body where they are used to produce energy or for growth and development or stored for future use. 5. Egestion : The undigested and unabsorbed residues of food are thrown out of the body. A.III Draw a neat and labelled diagram of the following: (Any One) (i) Human digestive system. Oral cavity Salivary glands Oesophagus Liver Gall bladder Stomach Pancreas Large intestine Small intestine Anus

7 Pancreas with their associated structures. Gall bladder Bile duct Common duct Pancreatic duct Pancreas (iii) Neuron. Dendrites Cyton (cell body) Nucleus Axon

MAHESH TUTORIALS SECTION - A

MAHESH TUTORIALS SECTION - A 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