Question
A ray of light passes through a glass prism.

Image
9. When do the light rays get refracted?
Circle ‘Yes’ or ‘No’ to mark your responses.

When do the light rays get refracted?

Yes or No

As the light ray enters the prism from the air

Yes/No

As the light rays travel inside the prism

Yes/No

As the light rays move from the prism into the air

Yes/No

10. Why do leaves appear green?

Answer

9. Yes
No
Yes
10. Mentions that the leaves absorb all colours and relect only the green colour to the eyes

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions


Read the following and answer any three questions from: (i) to (iv).
A group of ecologists studied and monitored the change in population of three animal species X, Y and Z over a period often years. During their research, they found that a new animal species W appeared in the area and its population was also monitored.
  1. Which animal species will unlikely to be alive in IO years without some intervention?
     
  2. Which species is most likely be the food source of W?
     
  3. What will be the likely consequence if population of X completely declines?

    OR
     
  4. A) What would be the most probable reason for the constant population of Z?
    B) What could be the reason for declining of X?
The picture shows different layers of rocks with fossils dug out from two different places.

Image
4. Which layer of rocks contains the youngest fossil?
A. Layer 1
B. Layer 5
C. Layer 6
D. Layer 10
5. Which layers of rocks must have formed during the same time period?
A. Layer 1 and Layer 6
B. Layer 3 and Layer 9
C. Layer 4 and Layer 8
D. Layer 5 and Layer 10

The igure shows the movement of a stem. X is a part of the stem.
The movement of plant hormone auxin in cells regulates cell elongation and growth of plants in a
particular direction.

Image
1.What would the size of cells and the distribution of auxin at part X of the stem look like?

Image
2. How can the movement of the stem in a particular direction be described?
A. Against gravity
B. Away from touch
C. Away from chemicals
D. Towards a source of water
3. Cell division in plants is promoted by _______________________.
A. Auxin
B. Abscisic acid
C. Cytokinins
D. Gibberellins

A student was asked to perform an experiment to study the force on a current carrying conductor in a magnetic field. He took a small aluminum rod AB, a strong horse shoe magnet, some connecting wires, a battery and a switch and connected them as shown. He observed that on passing current, the rod gets displaced. On reversing the direction of current, the direction of displacement also gets reversed. On the basis of your understanding of this phenomenon, answer the following questions :
Image
(a) State the condition under which the displacement of the rod is largest for the same magnitude of current flowing through it.
(b) State the rule that determines the direction of the force on the conductor AB.
(c) i. If the U shaped magnet is held vertically and the aluminum rod is suspended horizontally with its end B towards due north, then on passing current through the rod from B to A as shown, in which direction will the rod be displaced?
ii. Name any two devices that use current carrying conductors and magnetic field.
OR
Draw the pattern of magnetic field lines produced around a current-carrying straight conductor held vertically on horizontal cardboard. Indicate the direction of the field lines as well as the direction of the current flowing through the conductor.
When steam is passed through red hot iron, iron oxide and hydrogen gas is formed.
The balanced equation for the reaction is shown below.
$\begin{array}{l}\ce{3Fe + 4 H _2 O \longrightarrow Fe_3O_4 + 4H_2} \\ \begin{array}{llll}\text { (Iron) } & \text { (water) } & \text { (iron oxide) } & \text { (hydrogen) }\end{array} \\\end{array}$
$1.$ Is heating iron to red hot a physical or a chemical change? Explain your answer.
$2.$ What is true for the balanced chemical equation shown above?
$A.$ Four atoms of water combine with iron to form four atoms of hydrogen.
$B.$ Three atoms of iron combine with water to form four atoms of hydrogen.
$C.$ Four molecules of water combine with iron to form an atom of iron oxide.
$D.$ Three atoms of iron combine with water to form one molecule of iron oxide.
Read the following and answer any three questions from (i) to (iv).ln fermentation, the incomplete oxidation of glucose achieved under anaerobic conditions by sets of reactions where pyruvic acid is converted to $CO _2$ and ethanol. The enzymes, pyruvic acid decarboxylase and alcohol dehydrogenase catalyse these reactions.
i. What is photosynthesis?
  1. Represent Fermentation by the equation?
  2. A test tube containing molasses solution and yeast is kept in a warm place over Night. The gas collected from that mixture will result in.

    OR
  3. a) How does Ethyl alcohol fermentation occur?
    b) what is pyruvic acid?
Read the following and answer any three questions from (i) to (iv).The table given below shows six organic compounds A, B, C, D, E and F having different molecular formula:
Organic compound
Molecular formula
A
$C _7 H _{16}$
B
$C _8 H _{16}$  
C
$C _4 H _6$  
D
$C _6 H _{10}$  
E
$C _5 H _{10}$  
F
$C _9 H _{20}$
  1. Write compounds belonging to the same homologous series?
     
  2. Write the member of the same homologous series as E with the help of the table?
     
  3. Identify Compound B from a given table.

    OR
     
  4. A) Write the general formula of Compound (F).
    B) Explain Different between organic and molecular compounds.
1. Which source of energy for cooking will produce the least air pollution?
A. Petrol
B. Coal
C. LPG
D. Wood
Alisha digs a pit in her garden and puts the following items in it.
● paper cups
● glass bowls
● fruit peels
● rubber slippers
She then covers the pit with soil.
8. Which item will decompose first?

Read the following and answer any three questions from: (i) to (iv).
Food web is a network of food chains which become interconnected at various trophic levels so as to form a number of feeding connections amongst different organisms of a biotic community. Different food webs operate in different ecosystems. One such food web operating in an ecosystem is given ahead. Study it carefully and answer the following.
  1. What is the primary energy input in this food web?
     
  2. How many food chains are operating in the given food web?
     
  3. When a new species 'X' was introduced into the community, the population of toads rose and population of skunks fell over the subsequent two weeks. Species 'X' is most likely to be what?
    OR
     
  4. a) Which organisms in the food web passes most of its energy to the subsequent trophic levels?
    b) Which organisms would be most affected if the oak tree fails to flower?