Science and Technology 1 Model set 1 by shaalaa.com 2021-2022 SSC (English Medium) 10th Standard Board Exam Question Paper Solution

The value of universal gravitational constant (G) in the SI unit is ______.

6.673 × 10^-11 Nm²/kg²

6.673 × 10¹¹ Nm/kg

9.673 × 10^-11 Nm/kg

9.673 × 10^-11 Nm²/kg²

The chemical reaction in which two or more products are formed from a single reactant is called _______ reaction.

decomposition

combination

displacement

double displacement

The right-hand thumb rule is also called _______ rule.

Newton’s law of motion

Newland’s law of Octave

Mendeleev’s periodic law

Maxwell’s cork- screw

Extraction of moderately reactive elements is done by _______ and _______ method.

roasting and calcination

roasting and reduction

separation and calcination

none of these

The unsaturated hydrocarbons containing a carbon-carbon double bond are called _______.

Alkenes

Alkanes

Alkynes

Alcohol

Find the odd one out and give its explanation.

Sputnik

Moon

Swayam

Chandrayaan

₂n₁ : Refractive index of medium 2 with respect to medium 1 : : ₁n₂ : _______

Cyclohexane is a branched chain type of hydrocarbon.

Right

Wrong

Write the name.

The part of human eye that transmits electrical signals to the brain.

Match the columns.

Write scientific reason.

The value of acceleration g is greater at the pole than at the equator.

Write scientific reason.

Satellite launch vehicles are used to place satellites in their specific orbits.

Write scientific reason.

Nearsightedness, this defect can be corrected by using spectacles with concave lens.

Write a short note.

Specific heat capacity

Complete the following table.

Explain the importance/uses of fuse wire.

Explain the following reaction with example.

Addition reaction

If a person weighs 750 N on Earth, what will be the weight of the person on moon?

(The mass of moon is `1/81` times the mass earth and its radius is `1/3.7` times that of earth.)

Position of A, B and C three elements is given in the table from the modern periodic table. Answer the following questions.

1. What is A element metal or nonmetal?
2. Which is the outermost orbit of element B?
3. Identify C element and it's physical state.

State the laws of refraction of light.

Explain the application of heating effect of electric current in an electric bulb with a diagram.

Name the following diagram appropriately.

Complete the following table with writing the correct structural formula and molecular formula.

Distinguish between:

s-block - p-block

If the absolute refractive index of glass and water are 3/2 and 4/3 respectively, what is the refractive index of glass with respect to water?

Complete the paragraph by choosing the right options given below.

(minimum, near point, 25 cm, farthest, farthest distance, far point)

The _______ distance of an object from a normal eye, at which it is clearly visible without stress on the eye, is called the minimum distance of distinct vision. The position of the object at this distance is called the _______ of the eye, for a normal human eye, the near point is at _______. The _______ distance of an object from a human eye, at which it is clearly visible without stress on the eye is called _______ of distinct vision. The position of the object at this distance is called the _______ of the eye.

Observe the following figure and write the answer of the question.

1. Which process is shown in the figure?
2. Explain the chemical reaction shown in the figure.
3. Write the reactions on anode and cathode.

Answer the questions on the following passage.

The minerals from which the metal can be separated economically are called ores. Ores contain many types of impurities such as soil, sand and rocky substances along with metal compounds. These impurities are called gangue.
Metals can be extracted from their ores by means of various methods of separation. The process of extraction of metal in a pure state from the ores is also a part of metallurgy.
Ores are taken out from the mines and the gangue is usually separated from the ore at the site itself by various methods. Then the ores are carried out to the place where metals are produced. Here metals are extracted in pure form. Then metals are further purified by different methods of purification. This entire process is called metallurgy. Most metals being reactive do not occur in nature in the free state but are found in combined state as their salts such as oxides, carbonates, sulphides, and nitrates. however, the most unreactive metals that are not affected by air, water and other natural factors like silver, gold, platinum, generally occur in a free state. The compounds of metals that occur in nature along with the impurities are called minerals.

1. What are ores?
2. Which processes are involved in the branch of metallurgy? What is metallurgy?
3. Which metals are found in a free state?
4. In what forms are metals found in combined state?
5. What is gangue?