School Teacher Recruitment Exam 2023 - Science Q&A
Q1. Which instrument is used for measuring electric potential?
(A) Potentiometer
(B) Galvanometer
(C) Voltmeter
(D) More than one of the above
(E) None of the above
Voltmeter is used for measuring electric potential i.e. Voltage.
Q2. Magnetic field is a
(A) Scalar quantity
(B) Vector quantityt
(C) Dimensionless quantity
(D) More than one of the above
(E) None of the above
Magnetic field is a vector quantity.
Q3. A man pushes more weight on the Earth at
(A) sitting position
(B) standing position
(C) lying position
(D) More than one of the above
(E) None of the above
Pressure is inversely proportional to the area.
Q4. The coloured light that refracts most while passing through a prism is
(A) Yellow
(B) Violet
(C) Blue
(D) More than one of the above
(E) None of the above
Violet light has the shortest wavelength among the given colored light thus has the highest refractive index, hence refracts most.
Q5. A piece of ice is dropped in a vessel containing kerosene oil. When ice melts, the level of kerosene oil will?
(A) Rise
(B) Fall
(C) Remain same
(D) More than one of the above
(E) None of the above
Q6.The pH of which of the following is more than 7?
(A) Gastric juice
(B) Blood plasma
(C) Vinegar
(D) More than one of the above
(E) None of the above
The pH of blood plasma is more than 7 i.e. around 7.4.
(A) 1 mm
(B) 25 cm
(C) 2 cm
(D) More than one of the above
(E) None of the above
Q8. Which substance is formed by the action of chlorine gas on dry slaked lime?
(A) Calcium Chloride
(B) Bleaching powder
(C) Hydrochloric acid
(D) More than one of the above
(E) None of the above
Q9. The process where the characteristics are transmitted from parents to offsprings is called?
(A) variation
(B) heridity
(C) gene
(D) More than one of the above
(E) None of the above
Q10. The point to be kept in mind for verification of Ohm’s law is
(A) ammeter and voltmeter should be connected in series
(B) ammeter should be connected in series and voltmeter in parallel
(C) ammeter should be connected in parallel and voltmeter in series
(D) More than one of the above
(E) None of the above
Q11. What happens when dilute hydrochloric acid is added to iron filings?
(A) Hydrogen gas and iron chloride are produced
(B) Chlorine gas and iron hydroxide are produced
(C) No reaction takes place
(D) More than one of the above
(E) None of the above
When dilute hydrochloric acid is added to iron filings, a chemical reaction occurs. The iron reacts with the acid, producing Iron (II) chloride and Hydrogen gas.
Fe + 2HCl → FeCl₂ + H₂
Q12. The best method to prevent flood is
(A) grazing
(B) afforestation
(C) deforestation
(D) More than one of the above
(E) None of the above
Q13. Food cans are coated with tin and not with zinc because
(A) zinc is costlier than tin
(B) zinc has a higher melting point than tin
(C) zinc is more reactive than tin
(D) More than one of the above
(E) None of the above
Food cans are coated with tin and not with zinc because zinc is more reactive than tin and can react with the organic acids present in the food. This can result in the formation of poisonous compounds that can contaminate the food and harm the consumers. Tin, on the other hand, is a less reactive metal that does not react with most food substances and provides a protective layer for the cans. This process is known as "tinning." This process is known as "tinning." The can is coated with a thin layer of tin, which provides a barrier between the food and the metal, preventing direct contact.
Q14. Which of the functions is performed by the ovaries?
(A) Formation of ovum
(B) Secretion of progesterone
(C) Secretion of estrogen
(D) More than one of the above
(E) None of the above
The ovaries perform all three given functions:
(A) Formation of ovum: Ovaries are responsible for producing and releasing ova (eggs) through a process called ovulation. Ova are the female reproductive cells that can potentially be fertilized by sperm.
(B) Secretion of progesterone: The ovaries secrete progesterone, primarily during the second half of the menstrual cycle (luteal phase) and during pregnancy. Progesterone plays a crucial role in preparing the uterine lining for implantation of a fertilized egg and in maintaining pregnancy.
(C) Secretion of estrogen: Estrogen is another hormone produced by the ovaries. It's responsible for the development of secondary sexual characteristics in females during puberty, regulation of the menstrual cycle, and maintenance of the female reproductive system.
Q15. Which acid is present in tamarind?
(A) Methanoic acid
(B) Tartaric acid
(C) Lactic acid
(D) More than one of the above
(E) None of the above
Q16. Coliforms are
(A) bacteria present in the digestive tract of animals
(B) bacteria present in hot springs
(C) bacteria present in frigid environment
(D) More than one of the above
(E) None of the above
Coliform bacteria are a group of Gram-negative, non-spore forming, rod-shaped bacteria commonly found in the intestines of warm-blooded animals, including humans and animals like cows, pigs, and birds.
Some examples of coliform bacteria are Escherichia coli, Enterobacter aerogenes, and Klebsiella pneumoniae.
Coliforms are not typically found in hot springs or frigid environments, as these are extreme conditions that most coliforms cannot tolerate. However, there may be some exceptions, such as thermophilic (heat-loving) or psychrophilic (cold-loving) coliforms that have adapted to these environments. But being specific A should be the answer.
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