Compulsory Science and Technology Question Paper 2082 GP (Old Question)

Why is sea-urchin kept in phylum Echinodermata?

(i) Because their bodies are externally covered by hard calcareous spines

(ii) Because their bodies have muscular feet to help in swimming in water and gliding on the surface

(iii) Because their body is soft

(iv) Because it has tentacles on the head

Which of the following statements is correct about queen bee?

(i) Queen bee feeds honey and bread to larvae

(ii) Queen bee makes the hive warm

(iii) A hive has a large number of queen bees

(iv) In a hive, the queen bee lives the longest

Which of the following plants has antioxidant and antimicrobial properties as well as the capacity to relieve stress, depression and anxiety?

(i) Turmeric

(ii) Asiatic pennywort

(iii) Gurjo

(iv) Neem

What will be the weight of a man on the Moon, if his weight on the Earth is 750 N? (Acceleration due to gravity of the Moon = 1.63 m/s2)

(i) 124.7 N

(ii) 125 N

(iii) 126.8 N

(iv) 127.8 N

Which of the following phenomena is based on the high specific heat capacity of water?

(i) The temperature of water in ocean does not vary much between day and night

(ii) Even when the surface of Mountain Lake freezes in winter, fish don't die

(iii) Water pipes burst in winter

(iv) Temperature of water remains constant while boiling

Which of the following correctly describes the properties of an image formed by a convex lens when object is placed between 'f' and '2f'?

(i) Virtual, erect and diminished

(ii) Virtual, inverted and magnified

(iii) Real, inverted and magnified

(iv) Real, erect and magnified

A transformer has 6,000 turns in the primary coil and 1,000 turns in the secondary coil. Calculate the secondary voltage if the primary voltage is 210 V.

(i) 25 V

(ii) 35 V

(iii) 45 V

(iv) 55 V

Which substance is the product 'Z' in the given chemical reaction? (CO2 + H2O -> Z)

(i) HCO

(ii) H2CO2

(iii) H2CO3

(iv) COOH

Which of the following represents an alkene?

(i) CnH2n+2

(ii) CnH2n-2

(iii) CnH2n-1

(iv) CnH2n

Which of the following compounds is used to ripen fruits?

(i) Sodium carbonate

(ii) Calcium carbonate

(iii) Calcium carbide

(iv) Sodium sulphate

Certain variables should be controlled in a scientific experiment, why?

Write an application of QR code.

Write a characteristic of the given organism on the basis of respiration.

Write a function of worker bee after 21 days.

Why can't a digital clinical thermometer be used to measure the temperature of boiling water?

Write any one difference between the following figures on the basis of their working principles.

FIGURE A FIGURE B

Draw a current-time graph of alternating current.

Draw a well labelled diagram of electrorefining process of purification of impure silver.

An ore contains a mixture of iron dust and zinc sulphide. Which method can be used to separate them?

Provide examples of the other two categories of variables present in scientific experiments, excluding the controlled variable.

Write any two differences between frog and fish based on the habitat and the structure of heart.

Study the given figures and write any two differences between them.

fig i fig ii

Identify the health problem which has symptoms like, sweating, feeling tiredness, difficulty in respiration, feeling intolerable pain due to stress in chest, etc. Write a preventive measure of that problem.

A student used the sap of the leaves of the plant shown in the figure when her/his skin was burnt by steam. For what other two purposes can this plant be used?

Why does a stone sink when dropped in water? Explain on the basis of the law of floatation.

When a magnet is introduced into a coil, what happens to the needle of galvanometer? If the magnet is held at rest inside the coil, what will happen to the needle?

If hot water of mass 10 kg at 90°C is mixed with 20 kg of cold water at 20°C, what is the final temperature of the water? (Specific heat capacity of mixture is 4200 J/kg°C.)

Define the process which is shown in the figure and write any one application of it.

Write any two differences between an open closed universe.

A student mixed 10 ml ammonium hydroxide with 10 ml hydrochloric acid in a beaker.

A colourless viscous liquid hydrocarbon is used as a sweetening agent in confectionery.

Give an example of the insecticides on the basis of the targeted organism of the following.

The use of digital devices and technologies such as mobile phones and laptops is increasing in our daily lives. In this scenario, write two positive impacts and two negative impacts of digital technology.

Black-eyed offspring were born from a black-eyed father and brown-eyed mother. Why did the offspring had black-eyes but not brown in the first generation? Show the filial chart of this process up to the second generation and write down the genotypic ratio of the second generation.

The external structure of the heart is shown in the given diagram.

A stone is dropped from a tall tower that reaches the ground after 4 s. Calculate the velocity with which the stone lands on the ground.

Given,

Time taken to reach the ground from the tower

Initial velocity

Acceleration due to gravity

Final velocity

According to the formula,

or,

or,

The velocity with which the stone lands on the ground .

A student sitting at the back of his class has difficulty in reading the letters on the whiteboard placed on the front wall of the classroom, but he can read his book easily.

Study the part of the periodic table given below and answer the following questions.

Study the given diagram and answer the following questions.