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CLASS: VII

DEPARTMENT: SCIENCE DATE: 28.09.2020

MARKS: 80 MID TERM QP AND MS DURATION: 2.5Hr

Date: 28-09-2020 Max. Marks: 80

Class: VII Subject: Science Time: 2.5 hours

SECTION A-OBJECTIVE-(1m each)

I- Multiple Choice Questions-

1. Two organisms are good friends and live together. One provides shelter, water, and nutrients while the other prepares and provides food. Such an association of organisms is termed as- (i) saprophyte (ii) parasite (iii) autotroph (iv) symbiosis

2. A copper ball at 55˚C is dropped in a mug containing water at 55˚C. The heat will –

a] Flow from iron ball to water.

b] Not flow from iron ball to water or from water to iron ball.

c] Flow from water to iron ball.

d] Increase the temperature of both.

3. What do farmers add to reduce the acidity of the soil?

a) Sodium hydroxide b) Potassium hydroxide c) Sodium chloride d) Calcium oxide

4. Organisms which prepare food for themselves using simple naturally available raw

materials are referred to as-

(i) heterotrophs (ii) autotrophs (iii) parasites (iv) saprophytes

5. Cud is the name given to the food of ruminants which is- i) swallowed and undigested. ii) swallowed and partially digested. iii) properly chewed and partially digested.iv) properly chewed and completely digested.

6. The process of rearing silk worms to obtain silk is called-

a) Silviculture b) Sericulture c) Silkin d) Scouring

7. Waste water released by houses is called-

(i) drainage (ii) domestic sewage (iii) garbage (iv) pollution

8. When a body covers equal distance in equal interval of time then it is-

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INDIAN SCHOOL AL WADI AL KABIR

i) Periodic motion ii) Non-uniform motion iii) Average speed iv) Uniform motion

9. Electric Bell works on the principle- Electrical energy is converted into mechanical energy. Electrical energy is converted into sound energy. Mechanical energy is converted into sound energy. Sound energy is converted into electrical energy.II- Assertion and Reasoning-

1. Assertion (A): Mushroom is a parasite. Reason(R): It takes in nutrients in solution form from dead and decaying matter. [iv] i) Both A and R are true and R is correct explanation of the assertion. ii) Both A and R are true but R is not the correct explanation of the assertion. iii) A is true but R is false. iv) A is false but R is true2. Assertion (A) - Calamine lotion is applied on the skin when an ant bite.

Reason (R) - Ant bites are painful and cause burning sensations.

(ii: Both A and R are true but R is not the correct explanation of the assertion.)

3. Assertion (A) - Villi are present in the inner lining of stomach.

Reason (R) - The villi increase the surface area for absorption of the digested food. (iv- A is false but R is true) 4. Assertion (A) - The process of selecting parents for obtaining special characters in their offspring is termed ‘selective breeding’ Reason (R) - Selective breeding is done in silkworms. (iii) A is true but R is false.]

5. Assertion (A) - A faster moving object covers more distance in less time. Reason (R) - The speed of faster moving object is less. (iii) A is true but R is false.

6. Assertion (A)- Fuse is a safety device which prevents damages to electrical circuits and possible fires.

Reason (R)- The fuse wire blows off and breaks the circuit. Thus, it prevents the fire and damage. (i) Both A and R are true and R is correct explanation of the assertion.

III- Picture Based Questions-

1. Identify A and B in the given picture of photosynthesis process.

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A- oxygen, B- carbon dioxide A- carbon dioxide, B- oxygen

A- oxygen, B- nitrogen A- nitrogen, B- oxygen

2. Some pins are stuck to a metal rod with wax and a lighted candle is kept below the rod as

shown in the diagram below. Which one of the pins will fall off the metal rod first?

Pin P because heat will transfer due to conduction.

Pin S because heat will transfer due to conduction.

All pins will fall together.

Pin P because heat will transfer due to convection.

3. Identify -A, B, C and D in the following picture.

i) A- canines, B- premolars, C- incisors, D- molars

ii) A- molars, B- premolars, C- incisors, D- canines

iii) A- incisors, B- canines, C- premolars, D- molars

iv) A- canines, B- premolars, C- molars, D- incisors

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4. Identify the process related with processing of wool fibre.

Shearing Carding Sorting Scouring

5. The ancient instrument to measure time in the given picture is-

water clock sundial sand clock candle clock

6. The bulb in the given electric circuit is not glowing. What necessary change should be done to make the bulb glow?

Switch should be at OFF position.

Positive terminal of a cell should be connected to positive terminal of another cell.

Negative terminal of a cell should be connected to the positive terminal of another cell.

Only one cell should be used.

IV- Fill in the blanks-

1. The __________ plant traps and feeds on insects.

Cuscuta China rose Pitcher Rose

2. __________ is present in tamarind.

(a) Hydrochloric acid b) Tartaric acid c) Citric acid d) Oxalic acid

3. The larvae which hatch from the eggs of silk moth are called as _______.

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caterpillars pupa cocoon baby moth

4. The dissolved and suspended impurities in water are called as _________

(i) Contaminants (ii) Dirt (iii) Germs (iv) Sludge

5. The basic unit of speed is ______.

km/min m/min km/h m/s

6. The slope of the distance-time graph represents_______ of the object.

i) Distance ii) Time iii) Speed iv) Motion

V- Match the following-

1. Sea breeze During day time

2. Battery Combination of more than 2 cells

3. Radiation No medium

4. Element Coil of wire

5. Temperature Celsius

VI- Passage Based Questions-

If we dig ground deeper and deeper, we would reach a level where all the space between particles of soil and gaps between rocks are filled with water. The upper limit of this layer is called the water table. The rainwater and water from other sources such as rivers and ponds seeps through the soil and fills the empty spaces and cracks deep below the ground. The groundwater thus gets recharged. The process of seeping of water into the ground is called infiltration. At places the groundwater is stored between layers of hard rock below the water table. This is known as an aquifer. Water in the aquifers can be usually pumped out with the help of tube wells or handpumps.

1. An aquifer is the-

groundwater which is stored between layers of hard rock below the water table.

groundwater which is stored between layers of hard rock above the water table.

lower limit of water table.

water present in the cracks of rocks on the surface of the earth.

2. The process of infiltration is-

Removal of groundwater by pumps.

Collection of rainwater in rivers.

Condensation of water vapours.

Seeping of water into the ground.

3. The two ways by which water from the aquifer can be pumped out-

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Tube well and ponds Hand pump and water tank

Tube well and hand pump Tap and hand pump

4. How do the empty spaces and cracks below the ground get filled by water?

Melting of ice caps Condensation of water vapours

Seepage of rainwater and water from other sources such as rivers and ponds.

Evaporation of water from rivers

VII- Case Study Based Questions-

Our stomach is a thick-walled bag. Its shape is like a flattened U and it is the widest part of the alimentary canal. The inner lining of the stomach secretes A, B and digestive juices. Many bacteria that enter along with the food are killed in the stomach.

1. Identify A and B which are secreted in the stomach.

Mucous and pancreatic juice Mucous and bile juice

Bile juice and saliva Mucous and hydrochloric acid.

2. What kills the bacteria which enter along with food in the stomach?

Hydrochloric acid Mucous Bag structure Digestive juices

3. Which component of food gets digested in the stomach?

Starch Sugar Fats Proteins

4. The medium in the stomach is acidic. What protects the lining of the stomach?

SECTION B- SHORT ANSWER QUESTIONS-3M

1. (a) Draw a neat and labelled diagram of a stomata.

(b) Mention the importance of chlorophyll in photosynthesis.

2. (a) What do you understand by neutralisation reaction? Write the word equation for it.

(b) Explain why: An antacid tablet is taken when you suffer from acidity.

3. (a) Define shearing. Why is shearing done only in summer?

(b) Why is the silk fibre of mulberry silk moth preferred?

4. (a) Give one example for an oscillatory motion and periodic motion each.

(b) What are quartz clocks?

(c) Identify the type of motion of a car shown by the following graph-

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5. (a) Draw a neat circuit diagram of a closed electric circuit consisting of electric wire, switch, bulb and a cell.

(b) Babita made an electromagnet by winding 50 turns of wire over an iron screw. Payal also made an electromagnet by winding 100 turns over a similar iron screw. Which electromagnet will attract more pins? Give reason.

SECTION B- LONG ANSWER QUESTIONS- 5M

6. (a) Write any one difference between clinical and laboratory thermometer.

(b) Why do we wear light coloured cotton clothes in summer?

(c) The air conditioners are fitted at higher level in the rooms. Justify.

(d) It is preferred to use two thin blankets rather than one thick blanket. Explain.

7. (a) What are indicators? Give two examples for natural indicators.

(b) What change will take place when a drop of soap solution is added on a strip of turmeric paper and why?

(c) Write any one difference between acid and base.

8. (a) No digestion takes place in large intestine yet its role is important. Justify.

(b) Label the parts A, B, C and D in the given figure-

(c) Where is the bile produced? Which component of the food does it digest?

9. (a) What do the speedometer and odometer of a car record?

(b) A car travels a distance of 480 km in 8 hours. Calculate its speed.

(c) What is meant by time period of a simple pendulum? Mention any one factor on which the time period depends.

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10. (a) An electric circuit is set up as shown and a magnetic compass is kept beside it.

(i) What will you observe in the needle of the compass when you switch off the current? Give reason for it.

(ii) What will you observe in the needle of the compass if the direction of current is reversed?

(b) Write the full form for- MCBs. (c) Name any one factor on which the heat produced in a wire depends upon.

ANSWER KEY- SECTION A

Q.No. Answer Marks

I MULTIPLE CHOICE QUESTIONS 1m x 9 = 9m

1 Symbiosis 1m

2 Not flow from iron ball to water or from water to iron ball. 1m

3 Calcium oxide 1m

4 Autotrophs 1m

5 Swallowed and partially digested. 1m

6 Sericulture 1m

7 Domestic sewage 1m

8 Uniform motion 1m

9 Electrical energy is converted into sound energy. 1m

II ASSERTION AND REASONING 1m x 6= 6m

1 A is false but R is true 1m

2 Both A and R are true but R is not the correct explanation of the assertion

1m

3 A is false but R is true 1m

4 A is true but R is false. 1m

5 A is true but R is false. 1m

6 Both A and R are true and R is correct explanation of the assertion.

1m

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III PICTURE BASED QUESTIONS 1m x 6 = 6m

1 A- carbon dioxide, B- oxygen 1m

2 Pin P because heat will transfer due to conduction. 1m

3 A- incisors, B- canines, C- premolars, D- molars 1m

4 Scouring 1m

5 Sundial 1m

6 Negative terminal of a cell should be connected to the positive

terminal of another cell.

1m

IV FILL IN THE BLANKS 1m x 6 = 6m

1 Pitcher 1m

2 Tartaric acid 1m

3 Caterpillars 1m

4 Contaminants 1m

5 m/s 1m

6 Speed 1m

V MATCH THE FOLLOWING 1m x 5 =5m

1 During day time 1m

2 Combination of more than 2 cells 1m

3 No medium 1m

4 Coil of wire 1m

5 Celsius 1m

VI PASSAGE BASED QUESTIONS 1m x 4= 4m

1 Groundwater which is stored between layers of hard rock below the water table.

1m

2 Seeping of water into the ground. 1m

3 Tube well and hand pump 1m

4 Seepage of rainwater and water from other sources such as rivers and ponds.

1m

VII CASE STUDY BASED QUESTIONS 1m x 4 = 4m

1 Mucous and hydrochloric acid. 1m

2 Hydrochloric acid 1m

3 Proteins 1m

4 Mucous 1m

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ANSWER KEY- SECTION B

Q.No. Answer Marks

1.

a)

b) Chlorophyll helps to capture energy from sunlight to carry out the process of photosynthesis.

1m diag

+

1m label=2m

1m

2. a) The reaction between an acid and a base is known as neutralisation reaction.

ACID + BASE SALT +WATER

b) During acidity, an excess of acid is produced in the stomach. An antacid contains base, such as milk of magnesia. These bases react with excess of acids and neutralise their effect, thus giving us relief.

1+1=2m

1m

3. a) The process of removal of the fleece of the sheep along with the uppermost layer of skin.

Shearing is done in summer because sheep cannot survive without their coat of hair during winter.

b) The silk fibre obtained from mulberry moth is soft, lustrous, and elastic. It can be dyed in beautiful colours. Thus, it is preferred.

1m +1m=2m

1m

4. a) Suitable examples

b) Quartz clock is a special type of clock or watch which have an electric circuit with one or more cells.

c) Non-uniform motion

½ +1/2=1m

1m

1m

5.

a)

b) The magnetic effect directly depends on the number of turns of wire on electromagnet. So, electromagnet of Payal will attract more pins as it has a greater number of turns of wire on

1/2m x4=2m

1m

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it. Thus, it is a stronger electromagnet.

6. Clinical thermometer Laboratory thermometer

1] The range is from 35˚C to 42˚C

1] The range is generally from -10˚C to 110˚C

2] Kink is present 2] Kink is absent

3] It is used only for measuring human body temperature

3] It is used for measuring the temperature of other objects

a)

any

one

point

b) Light coloured cotton clothes give us a feeling of coolness by reflecting heat.

c) To produce quick cooling in the room because cool air from the air conditioner comes down and the warm air from below rises up.

d) The two thin blankets joined together will have a layer of air

trapped in-between them. Air doesn’t allow our body heat to

escape to the cold surrounding and hence keep us warm.

2m

1m

1m

1m

7. a) Indicators are substances which indicate the presence of acidic and basic solution by changing colour. Litmus/ turmeric/ China rose (any two)b) The turmeric paper will change its colour from yellow to red. It happens because soap solution is a basic substance.c) Acids are sour to taste/ they turn blue litmus red. Bases are bitter in taste/ turns red litmus blue/ soapy to touch.(any one difference)

1+1=2m

1m

1+1=2m

8. a) Its function is to absorb water and some salts from the undigested food material.b) A- Food pipe/ Oesophagus, B- stomach, C- small intestine, D-large intestinec) Liver secretes the bile juice which is temporarily

1m

1/2x4=2m

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stored in the gall bladder. Bile plays an important role in the digestion of fats. 2m

9. a) Speedometer of a car records speed of the car. Odometer of a car measures the distance moved by the vehicle.

b) Speed= distance/time = 480/8 = 8 km/h

c) The time taken by the pendulum to complete one oscillation is called its time period. The length of a string/the resistance offered by air (any one)

1m

1/2x4=2m

1+1=2m

10. a) (i) When we switch the current OFF, the compass needle comes to the rest position again because no magnetic field is produced in the absence of electric current. (ii) It is observed that the needle gets deflected in the opposite direction.

b) MCB- Miniature Circuit Breaker

c) Type of material/ length of wire/ thickness of wire (any one)

2m+1m=3m

1m

1m

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