CBSE Class 10 Science Objective type Questions & Answers

CBSE Class 10 Science Multiple Choice Questions(MCQs) & Answers CBSE Class 10 Science QUESTIONS

CBSE Class 10 Science Objective type Questions & Answers

51 The dramatic changes in body features associated with puberty are mainly because of the secretions of:
A Testosterone from thyroid gland and estrogen from pituitary gland
B Testosterone from testes and estrogen from ovary
C Estrogen from testes and testosterone from ovary
D Estrogen from adrenal gland and testosterone from pituitary gland

Answer: Testosterone from testes and estrogen from ovary
52 A doctor advised a person to take injection of insulin because his:
A Blood sugar was high
B Thyroxine level in blood was high
C Blood pressure was high
D Heart beat was high

Answer: Blood sugar was high
53 Which of the following control and regulate the life process?
A Nervous and endocrine systems
B Endocrine and digestive systems
C Reproductive and endocrine systems
D Respiratory and nervous systems

Answer: Nervous and endocrine systems
54 Which of the following controls the involuntary actions in the body?
A Medulla in hindbrain
B Medulla in midbrain
C Medulla in forebrain
D Medulla in spinal cord

Answer: Medulla in hindbrain
55 The process by which energy is produced in the sun is
A Nuclear fusion
B Nuclear fission
C Both nuclear fusion and fission
D Combustion of hydrogen

Answer: Nuclear fusion
56 The major constituent of biogas is
A Butane
B Ethane
C Propane
D Methane

Answer: Methane
57 The radiation present in the sunlight that gives us the feeling of hotness is
A Infra-red
B Ultra-violet
C Visible radiation
D Red

Answer: Infra-red
58 The energy efficient device for producing light is:

Answer: CFL
59 The disposal of wastes produced in a nuclear power plant is a big problem because it is:
A Too heavyn
B Highly radioactive
C Highly inflammable
D Extremely foul smelling

Answer: Highly radioactive
60 How many joules are there in 1eV?
A 1.6 × 10-13 J
B 9.1 × 10-31 J
C 1.6 × 10-19 J
D None of these

Answer: 1.6 × 10-19 J

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