April 24, 2024
Which of the following elements is/are used in making solar cells?
1. Silicon
2. Astatine
3. Sirium
4. Vanadium
  • (A) 1 only 
  • (B) 3 and 4 only 
  • (C) 1, 2 and 3 only     
  • (D) All of the above
Consider the following statements about friction.
1. Heat is generated due to friction.
2. Kabaddi players rub dust on their hands, so that friction is increased when they try to grab their opponents.
3. Friction applied by fluids is called drag.
4. Sliding friction is less than static friction.
Which of the statements given above is/are correct?
  • (A) 1, 2 and 3 only 
  • (B) 1 and 4 only 
  • (C) 2, 3 and 4 only 
  • (D) 1, 2, 3 and 4
Consider the following statements:
1. The fuels which are produced by plants and animals are called biomass.
2. The main Constituent of Biogas is Methane.
Which of the statements given above is/are correct?
  • (A) 1 only 
  • (B) 2 only 
  • (C) Both 1 and 2 
  • (D) Neither 1 nor 2
Why is there a great concern about the 'microbeads' that are released into environment?
  • (A) They are considered harmful to marine ecosystem.
  • (B) They are considered to cause skin cancer in children.
  • (C) They are small enough to be absorbed by crop plants in irrigated fields.
  • (D) They are often found to be used as food adulterants.
Due to which phenomena the stick if immersed in water appears to be bent?
  • (A) Reflection 
  • (B) Dispersion 
  • (C) Refraction 
  • (D) Scattering
Consider the following statements regarding food preservatives.
1. Sodium Benzoate and Sodium Metabisulfite are common food preservatives.
2. Salt, sugar, edible oil and vinegar are used as food preservatives.
Which of the statements given above is/are correct?
  • (A) 1 only 
  • (B) 2 only 
  • (C) Both 1 and 2 
  • (D) Neither 1 nor 2
Which of the following cells act as messengers?
  • (A) Spherical RBCs 
  • (B) Long branched nerve cells
  • (C) Spindle shaped muscle cells
  • (D) All of the above
Consider the following statements:
1. Hydro power plants convert the potential energy of falling water into electricity.
2. Construction of big dams generates greenhouse gas.
Which of the statements given above is/are correct?
  • (A) 1 only 
  • (B) 2 only 
  • (C) Both 1 and 2 
  • (D) Neither 1 nor 2
Sex hormones are secreted by endocrine glands. Consider the following statements regarding the same.
1. Estrogen and testosterone are sex hormones. These are responsible for the secondary sexual characters in the human body.
2. Estrogen is the male hormone, while testosterone is the female hormone.
Which of the statements given above is/are correct?
  • (A) 1 only 
  • (B) 2 only 
  • (C) Both 1 and 2 
  • (D) Neither 1 nor 2

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