www.afgji.org Air Force Golden Jubilee Institute : CBSE Proficiency Test Sample Paper

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For questions 1 to 9 only one of the four options is correct. You have to indicate your answer by filling the appropriate bubble in the Answersheet. A correct answer will earn 2 marks, a wrong answer will earn (??2 3 ) mark, and an unattempted question will earn 0 mark.
1. There are several microorganisms like amoebae and bacteria that live in water and use oxygen. Choose the option that describes the process by which oxygen enters the cell through the plasma membrane.
(A) The plasma membrane selectively takes in oxygen into the cell. This process needs energy.
(B) The plasma membrane selectively takes in oxygen into the cell. This process does not need energy.
(C) Oxygen enters into the cell from the surrounding water by diffusion. This process does not need any energy.
(D) Oxygen enters into the cell from the surrounding water by diffusion. This process needs energy.

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2. Select the option that gives the size of the components in a cell in an increasing order.
(A) ribosome, mitochondria, nucleus, ATP
(B) ATP, ribosome, mitochondria, nucleus
(C) mitochondria, ribosome, ATP, nucleus
(D) ATP, mitochondria, ribosome, nucleus
3. Select the correct statement about viruses.
(A) Viruses consume host cells by ingestion.
(B) Viruses depend on the host cells for respiration.
(C) Viruses reproduce outside the host cells and spread infection to other host cells.
(D) Viruses do not have any metabolic process occurring within themselves.
4. There are two samples of 2 g each of hydrogen and helium gases. Which of the following statements is true?
(A) Number of moles of hydrogen is the same as that of helium.
(B) Number of moles of hydrogen is double that of helium.
(C) Number of moles of hydrogen is half that of helium.
(D) Number of moles of hydrogen is four times that of helium.
5. A student needed to find out the polarity (+ or ??) of the two terminals of a battery coming out of a device.
She made a setup by placing the two wires inside water (with little lemon added) in a glass and checked if
gases were bubbling out from the wire ends. Which of the following is correct?
(A) The wire end with higher quantity of gas bubbles is the negative terminal.
(B) The wire end with higher quantity of gas bubbles is the positive terminal.
(C) The wire end with no gas coming out is the negative terminal.
(D) The wire end with no gas coming out is the positive terminal.

Section II: Numerical questions
This section contains 3 questions.
For questions 10 to 12 the answer is an integer between 0 and 99. You have to indicate the answer by filling bubbles in the appropriate grid provided in the Answersheet. Each question carries 4 marks.
10. Haemophilia or bleeder’s disease is a condition which prevents formation of factor VIII, an important blood clotting factor. The gene for factor VIII is carried on the X chromosome. This gene can appear in
two forms – normal (dominant) and mutant (recessive). Thus, a female with genotype XHXh carries one copy of normal gene (H) and one mutant (h). She is called a carrier. Such a woman marries a normal male
(XHY). What is the probability that their first child will be a normal son? Express the answer in percentage.
11. The pH of an acid solution is related to the concentration c of the H+ ion by the relation c = 10??x, where x is the pH value. 10 ml of an HCl solution of pH value x = 2 is diluted with water to get a final volume of
100ml. Calculate the pH value of the final solution.
12. The weight of an empty glass is 1 N. When completely filled with water, the glass weighs 4 N. If you now throw the water away and fill the glass partly with sand, the weight becomes 4 N. If the rest of the glass is
now filled up with water, the weight becomes 6 N. What is the relative density of sand?

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