Students can access the CBSE Sample Papers for Class 10 Science with Solutions and marking scheme Term 2 Set 6 will help students in understanding the difficulty level of the exam.
CBSE Sample Papers for Class 10 Science Term 6 Set 4 for Practice
Time: 2 hours
Maximum Marks: 40
General Instructions:
- All questions are compulsory.
- The question paper has three sections and 15 questions.
- Section-A has 7 questions of 2 marks each; Section-B has 6 questions of 3 marks each; and Section-C has 2 case based questions of 4 marks each.
- Internal choices have been provided in some questions. A student has to attempt only one of the alternatives in such questions.
Section – A
Question 1.
A homologous series is a series of organic compounds which belong to the same family (i.e. possess
same functional group) and show similar chemical properties.
(a) Write chemical formula of two consecutive members of a homologous series of alcohol.
(b) State the part of these compounds that determines their
(i) physical properties,
(ii) chemical properties. [2]
Question 2.
The electronic configuration of two elements ‘A’ and ‘B’ are 2, 8,3 and 2,8, 7 respectively.
(a) Find the atomic number of these elements.
(b) State the nature and formula of the compound formed by the union of these two elements. [2]
Question 3.
In order to perform an experiment, Kajal took three bread slices and kept them in the following conditions:
(i) Slice 1 in dried and dark place.
(ii) Slice 2 in moist and dark place.
(ii) Slice 3 in refrigerator under moist conditions.
(a) What would she observe in each of the above conditions?
(b) Name the kind of organisms that reproduce by spore formation. [2]
Question 4.
(a) Sneha was studying human reproduction. Her class teacher asked her to state the name of the
events which occur in the reproductive system of a human female:
(i) if egg is fertilised.
(ii) if egg is not fertilised.
(b) Mention the changes that take place in uterus in case (i).
Question 5.
Nazia performed a monohybrid cross between homozygous tall pea plants denoted by TT and homozygous short pea plants denoted by tt. She obtained only tall plants denoted by Tt in the Fj generation. However, in F2 generation she obtained both tall and short pea plants. Does the given information, explains the law of dominance? If yes, explain. [2]
OR
Mr. Naresh and his wife have attached earlobes (recessive trait) and are professional dancers. They told their colleagues that their offspring would also have attached earlobes and will be a good dancer. Is their notion right? Support your answer with suitable reasons. [2]
Question 6.
An α-particle enters a uniform magnetic field at right angles to it as shown in figure
(a) Stating the relevant principle, identify the direction in which this a-particle moves. Give reason to support your answer.
(b) State whether an alpha particle will experience any force in a magnetic field if it is placed in the
field at rest. [2]
OR
Two student were playing with two magnets. They observed the magnets were sometimes attracting and sometimes repelling from their ends. They asked about magnets from their physics faculty. He demonstrated an activity with magnet’s ends and draw a diagram. Study the diagram given below.
(a) Identify the poles marked P and Q as North Pole or South Pole. Give reason in support of your answer.
(b) What is the direction of magnetic field lines inside a bar magnet ? [2]
Question 7.
The figure shows a food web arranged into trophic levels. [2] ED
How many energy-transferring steps away from the sun is the deer? How do you know?
Name and explain the phenomenon shown in the diagram. List out any three effects of the above phenomenon on humans.
Section – B
Question 8.
In the following table, six elements A, B, C, D, E and F (here letters are not the usual symbols of the elements) of the Modern Periodic Table with atomic numbers 3 to 18 are given: [3]
(a) Which of these is
(i) a noble gas
(ii) a halogen
(b) If B combines with F, what would be the formula of the compound formed?
(c) Write the electronic configurations of C and E.
Question 9.
The general formula for the molecule of alkene family is CnH2n.
(a) What is the molecular formula of the alkene if there are six H-atoms in it?
(b) What is the molecular formula and structural formula of the first member of the alkene family?
(c) Write the molecular formulae of lower and higher homologues of an alkene which contains four
carbons. [3]
OR
The given table is about the three homologous series of hydrocarbons. Complete the table based on your knowledge.
Question 10.
Ajay’s friend Nikhil has four sons and one daughter. He believes that he produces more sperms with
Y chromosome. Do you agree? With suitable reasons, justify whether he is right or wrong in thinking this way. [3]
Question 11.
(a) From the given table, identify the metal / alloy that should be used to make the following gadgets:
| Metal or Alloy | Resistivity (in Ω m) |
| .Silver | 1.60 × 10-8 |
| Copper | 1.62 × 10-8 |
| Tungsten | 5.20 × 10-8 |
| Nichrome | 100 × 10-6 |
(i) Heating element of electric geysers.
(ii) Filament of incandescent bulbs.
(b) An electric iron has rating of 750 W, 220 V Calculate:
(i) Current required and,
(ii) Its resistance when it is in use.
Question 12.
Carefully study the circuit diagram and calculate the value of resistance ‘x’. [3]
OR
Calculate the equivalent resistance between the point A and 13 of the circuit given below.
Question 13.
The activities of man had adverse effects on all forms of living organisms in the biosphere. Unlimited exploitation of nature by man disturbed the delicate ecological balance between the living and non¬living components of the biosphere. The unfavourable conditions created by man himself threatened the survival not only of him but also of the entire living organisms on the mother earth. One of your classmates is an active member of ‘Eco club’ of your school which is creating environmental awareness amongst the school students, spreading the same in the society and also working hard for preventing environmental degradation of the surroundings.
(a) Why is it necessary to conserve our environment?
(b) What does the green and blue dustbin signifies.
(c) What is the importance of these two types of dustbins? [3]
Section – C
This section has 02 case-based questions (14 and 15). Each case is followed by 03 sub-questions (a), (b), (c). Parts (a) and (b) are compulsory. However, an internal choice has been provided in part (c).
Question 14.
While doing experiment on pea plants. A scientist found that pea plants can have round seeds or wrinkled seeds. Also; one of the phenotypes i.e. round seed is completely dominant over the other i.e. wrinkled. So, one day he decides to pollinate one flower of a plant with round seeds using pollen from
plant with wrinkled seeds.
(a) Mention the genes for the traits of parents. [1]
(b) State the trait of F1 hybrids. [1]
(c) Write the ratio of F2 progeny obtained from this cross. What is the name of the cross? [2]
OR
Why are the traits acquired during the life time of an individual not inherited? Explain. [2]
Question 15.
Sanjana described a magnetic field by drawing the magnetic field lines. She explained that when a small north magnetic pole is placed in the magnetic field created by a magnet, it will experience a force. And if the North Pole is free, it will move under the influence of magnetic field. Since the direction of magnetic field line is the direction of force on a north pole, so the magnetic field lines always begin from the N-pole of a magnet and end on the S-pole of the magnet. Inside the magnet, however the direction of magnetic field lines is from the S-pole of the magnet to the N-pole of the magnet. Thus, the magnetic field lines are closed curves. When a small compass is moved along a magnetic field line, the compass needle always sets itself along the line tangential to it. So, a line drawn from the south pole of the compass needle to its north pole indicates the direction of the magnetic field at that point.
Based on the given passage answer the following questions:
(a) What is meant by magnetic field lines ? [1]
(b) What does the degree of closeness of magnetic field lines near the poles signify ? [1]
(c) Give two uses of a magnetic compass. [2]
OR
What are the characteristics of magnet field lines? [2]