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SCIENCE CLASS 7 MID TERM EXAMS 2020 - 2021

(a) Both acids and bases change colour of all indicators.
(b) If an indicator gives a colour change with an acid, it does not give a change with a base.
(c) If an indicator changes colour with a base, it does not change colour with an acid.
(d) Change of colour in an acid and a base depends on the type of the indicator.
(i) All four
(ii) a and d
(iii) b and c
(iv) only d

A carnivore with stripes on its body moves very fast while catching its prey. It is likely to be found in

(i) polar regions
(ii) deserts
(iii) oceans
(iv) tropical rain forests

Which features adapt polar bears to live in extremely cold climate?

(i) A white fur, fat below skin, keen sense of smell.
(ii) Thin skin, large eyes, a white fur.
(iii) A long tail, strong claws, white large paws.
(iv) White body, paws for swimming, gills for respiration.

Which option best describes a tropical region?

(i) hot and humid
(ii) moderate temperature, heavy rainfall
(iii) cold and humid
(iv) hot and dry
Which one of the following place is unlikely to be affected by a cyclone.                            
(i) Chennai
(ii) Mangaluru (Mangalore)
(iii) Amritsar
(iv) Puri
(a) In cockroaches, air enters the body through
(i) lungs
(ii) gills
(iii) skin
(iv) spiracles
During heavy exercise, we get cramps in the legs due to the accumulation of
(i) carbon dioxide
(ii) lactic acid
(iii) alcohol
(iv) water
During exhalation, the ribs
(i) move outwards
(ii) move upwards
(iii) move downwards
(iv) do not move at all

A car moves with a speed of 40 km/h for 15 minutes and then with a speed of 60 km/h for the next 15 minutes. The total distance covered by the car is:

(i) 100 km
(ii) 25 km
(iii) 15 km
(iv) 10 km

Which of the following relations is correct?

(i) Speed = Distance/Time
(ii) Speed = Distance × Time
(iii) Speed = 1/Distance × Time
(iv) Speed = Time/Distance
Nitric acid turn red litmus blue. 
True
False
Sodium hydroxide turns blue litmus red.
True
False
Sodium hydroxide and hydrochloric acid neutralise each other and form salt and water.
True
False
Indicator is a substance which shows different colours in acidic and basic solutions.
True
False
Frogs breathe through their skins as well as their lungs. 
True
False
The fishes have lungs for respiration. 
True
False
The size of the chest cavity increases during inhalation. 
True
False
Every object moves with a constant speed.
True
False
Distances between two cities are measured in kilometres.
True
False
The speed of a train is expressed in m/h.
True
False
Wind is air. ........... air.
Winds are generated due to ........... heating on the earth.
Near the earth’s surface ........... air rises up whereas cold air comes down.
Jammu and Kashmir has ........... climate.
Rajasthan ........... climate

Match the difference between acids and base

It changes the colour of turmeric indicator to red.Acids are sour in taste.
Bases are bitter in taste.It turns litmus paper red.
It feels soapy on touching.It doesn’t change the colour of turmeric indicator
It turns litmus paper blue.It doesn’t feel soapy on touching.
Match the column.
Lungs and skin Yeast
Stomata Frog
Chest cavitySkin
EarthwormLeaves
AlcoholFish
GillsDiaphragm
Name the source from which litmus solution is obtained. What is the use of this solution?
Is the distilled water acidic/basic/neutral? How would you verify it?
An antacid tablet is taken when you suffer from acidity.
Factory waste is neutralised before disposing it into the water bodies.
The tropical rainforest has a large population of animals. Explain why it is so.
Why do we often sneeze when we inhale a lot of dust-laden air?
The distance between two stations is 240 km. A train takes 4 hours to cover this distance. Calculate the speed of the train.
Three liquids are given to you. One is hydrochloric acid, another is sodium hydroxide and third is a sugar solution. How will you identify them? You have only turmeric indicator.
Explain, with examples, why we find animals of certain kind living in particular climatic conditions.
Suggest two methods to find out wind direction at a given place.
You want to buy a house. Would you like to buy a house having windows but no ventilators? Explain your answer.
Why does an athlete breathe faster and deeper than usual after finishing the race?
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