Geography: Our Environment
Fill in the blanks with suitable words:
1. The uppermost layer over the earth's surface is called the ________.
2. The innermost layer is the core with a radius of about ________ km.
3. Any natural mass of mineral matter that makes up the earth's crust is called a _____.
Fill in the blanks with suitable words.
1. The first animal to be tamed was the wild ancestor of the _______.
2. Some of the earliest plants to be domesticated were _____ and barley.
3. Archaeologists have found in Burzahom (in present-day Kashmir) people built ____-houses, to protect them from winter season.
4. In Neolithic age, usually tools were ________ to give a fine cutting edge.
Fill in the blanks with suitable words.
1. ____ regulate the exchange of gases and the loss of water vapour from the leaves.
2. Who won the Nobel Prize for his work on photosynthesis?
3. ____are stacks of thylakoid membrane.
4. Photosynthesis occurs in which organelle of the cell?
5. Iodine can be used to test the presence of____.
Topics Covered: Work, Power and Energy
Q1: A bullet is fired from a rifle, If the rifle recoils freely, then the kinetic energy of the rifle will be:
(a) same as that of bullet
(b) more than that of bullet
(c) less than that of bullet
(d) none of these
Q2: A body of mass 2 kg, initially at rest, is acted upon simultaneously by two forces, one of 4N and the other of 3N, acting at right angles to each other. The work done by the body after the 20s is
(a) 500 J
(b) 1250 J
(c) 2500 J
(d) 5000 J
Q1: Which of the following does NOT characterise business activity?
(a) Production of goods
(b) Presence of risk and services
(c) Sale or exchange of goods and services
(d) Salary or wages
Q2: Which of the broad categories of industries covers oil refinery and sugar mills?
(a) Primary
(b) Secondary
(c) Tertiary
(d) None of them
Q3: Which of the following cannot be classified as an auxiliary to trade?
(a) Mining
(b) Insurance
(c) Warehousing
(d) Transport
Salts/Compounds Colour
1. Potassium dichromate, K₂Cr₂O₇ Orange
2. Potassium permanganate, KMnO₄ Violet
3. Ferric tetra-oxide, Fe₃O₄ Black
4. Ferrous sulphate, FeSO₄.7H₂O Green
5. Ferric sulphate, Fe₂(SO₄)₃ Yellow
6. Ferric hydroxide, Fe(OH)₂ Green
① Heat is a form of energy. We use this energy to generate electricity, among other things.
② The hotness or coldness of a body is relative.
③ The temperature of a body is a measure of the degree of hotness of the body. We measure it by comparing it with a universal standard.
④ The Celsius and Fahrenheit scales are commonly used to measure temperature. Ice melts at 0°C or 32°F. and water boils at 100°C or 212°F.
Q1: Who is the author of the story "A Triumph of Surgery"? What is the theme of the story?
Answer: James Alfred Wight pen named James Herriot wrote this story. The story "A Triumph of Surgery" is about a dog named Tricki. The theme of the story is about the blind love for the one whom we love the most. Mrs Pumphrey had no idea that her blind and extreme love for her dog Tricki took him to trouble. Excessive love made Tricki sick and became a reason for his illness. It can be concluded after reading the story that excessive love can take the form of extreme consequences.
Q1: What is an ordered pair?
Answer: An ordered pair is a pair of entries in the specified order.
Q2: What is ordered 2-tuple?
Answer: Another name of an ordered pair.
Q3: If A and B are any two sets, write to represent an ordered pair of elements of A and B?
Answer: (a, b) : a ∈ A, b ∈ B
Q4: Is (a, b) = (b, a)?
Answer: No. a, b) ≠ (b, a) unless a = b
Q1: What is meant by ‘efficiency’ in management?
Answer: Efficiency means doing the task correctly and with minimum cost.
Q2: How does management help in achieving personal objectives? State.
Answer: Management helps in achieving personal objectives by motivating and leading in such a way that the individual members are able to achieve personal goals while contributing to the overall organisational objectives.
Q3: Define ‘ planning premises’.
Answer: Planning premises are the assumptions made about the future on the basis of which the plans are drawn.
