CBSE Class 7 Science Quiz | CBSE Class 7 Science MCQs with Answers

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Questions
101 Insects have several openings on lateral sides of their bodies which lead to air tubes. These openings are called
A tracheae
B spiracles
C lungs
D gills

Answer: spiracles
102 During Inspiration or Inhalation, inside lungs
A volume decreases pressure increases
B volume increases pressure decreases
C volume decreases pressure decreases
D volume increases pressure increases

Answer: volume increases pressure decreases
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103 In earthworm, the exchange of gases occurs through ________.
A moist skin
B lungs
C gills
D tracheae

Answer: moist skin
104 Plants breathe through tiny pores in the leaves called ________.
A stomata
B pores
C leaf blade
D trachea

Answer: stomata
105 Organisms which respire in absence of air are called _________.
A microbes
B anaerobes
C aerobes
D none of these

Answer: anaerobes
106 Breathing is a ________ process while respiration is a _______ process.
A physical, chemical
B chemical, physical
C physical, physical
D chemical, chemical

Answer: physical, chemical
107 What is the heart rate of a normal adult human?
A 90-120 times per minute
B 70-80 times per minute
C 40-50 times per minute
D 10-20 times per minute

Answer: 70-80 times per minute
108 Phloem helps in the transport of _________ in plants.
A food
B water
C minerals
D carbon dioxide

Answer: food
109 Vascular tissues that transport water and nutrients in plants are called _________.
A Veins
B Phloem
C Xylem
D Root Hairs

Answer: Xylem
110 The major excretory product in humans is ________
A uric acid
B ammonia
C feaces
D urea

Answer: urea
111 Name the scientist who discovered blood circulation?
A William Harvey
B Isaac Newton
C Christiaan Barnard
D William Thomson

Answer: William Harvey
112 The filtering of blood through an artificial kidney is called ________
A dialysis
B diffusion
C circulation
D transportation

Answer: dialysis
113 Upper chambers of a human heart are called?
A atria
B ventricles
C pulmunory vein
D vena cava

Answer: atria
114 Which component of blood in mammals build up defense against harmful germs enter in the body?
A WBCs
B Platelets
C RBCs
D Plasma

Answer: WBCs
115 The fluid part of the blood is called _______
A Plasma
B Haemoglobin
C RBCs
D WBCs

Answer: Plasma
116 Name the pigment which gives red colour to the blood in mammals.
A Haemoglobin
B Globulin
C Plasma
D Platelets

Answer: Haemoglobin
117 The meter that is used to measure the distance moved by the vehicle is known as _____
A Speedometer
B Odometer
C Chronometer
D Ammeter

Answer: Odometer
118 Which of the following is a scalar quantity?
A Distance
B Displacement
C Velocity
D Force

Answer: Distance
119 Which of the following relations is correct?
A Speed = Distance × Time
B Speed = Distance ÷ Time
C Speed = Time ÷ Distance
D Speed = 1/(Distance × Time)

Answer: Speed = Distance ÷ Time
120 The metallic ball in a pendulum is called as _______
A Bob
B Rod
C Gong
D Fork

Answer: Bob

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