A device for producing electric current is_________
During pairing of chromosomes in meiosis,the_______chromosomes come to lie side by side
III. True or False
2 x 1 = 2
The speed of rotation of an electric motor can be increased by decreasing the area of the coil
Parenchyma is a simple tissue
IV. Answer any 15 questions in the following :
6 x 2 = 12
How much heat energy is required to change 2 kg of ice at 0ºC into water at 20ºC? (Specific latent heat of fusion of water = 3,34,000J/kg, Specific heat capacity of water = 4200JKg-1K-1).
What is the effective resistance across the terminals a and b of the arrangement of resistors?
Define magnetic flux density
Draw and label the diagram of an AC generator.
State modern periodic law.
Name the connective tissue with a fluid matrix.
Complete the missing terms in the following table:
Complete the following table referring the modern periodic table:
Total no of elements
Total no of elements in
Mark the correct choice as:
(a) If both assertion and reason are true and reason is the correct explanation of assertion.
(b) If both assertion and reason are true but reason is not the correct explanation of assertion.
(c) If assertion is true but reason is false.
(d) If assertion is false but reason is true. Assertion: Maximum sunlight reaches earth’s surface during the afternoon time. Reason: Heat from the sun reaches earth’s surface by radiation.
Statement: Elements in a group generally possess similar properties but elements along a period have different properties. Reason: The difference in electronic configuration makes the element differ in their chemical properties along a period.
a) Statement is true and reason explains the statement.
b) Statement is false but the reason is correct.
Assertion: Materials are exchanged between epithelial and connective tissues by diffusion. Reason: Blood vessels are absent in epithelial tissue.
How much heat energy is required to melt 5 kg of ice? (Specic latent heat of ice = 336 Jg-1)
Name any two appliances which work under the principle of heating effect of current.
State Faraday’s laws of electromagnetic induction.
A current carrying conductor of certain length, kept perpendicular to the magnetic field experiences a force F. What will be the force if the current is increased four times, length is halved and magnetic field is tripled?
What are the limitations of Mendeleev's periodic table?
Find the odd one out.
(i) H2, Cl2, NaCl, O2, N2
(ii) H2O2, MnO4–, LiAlH4, Cr2O72–
Two acids ‘A’ and ‘B’ are given. Acid A gives one hydrogen ion per molecule of the acid in solution. Acid B gives two hydrogen ions per molecule of the acid in solution.
(i) Find out the acid A and acid B.
(ii) Which acid is called the King of Chemicals?
Why is meiosis called reductional division and mitosis as equational division?
Name the parts of a computer
Complete the crossword using the clues
Left to right:
1) pair of electrons which do not take part in bond formation
2) reaction in which both oxidation and reduction takes place
3) rule which says about eight electrons in outermost shell Top to bottom:
a) bond formed by transfer of electrons from one atom to another
b) ion with positive charge
c) energy required to remove the most loosely bound electron from an isolated gaseous atom of an element
d) loss of electron
(lonepair, redox, octet, ionic, cation, ionisation,oxidation)
Identify the following parts:
1. It conducts food from pharynx to stomach by peristalsis-
2. Finger-like projections which enhances the absorbing capacity of small intestine-
3. The bunch of capillaries inside the Bowman’s capsule-
4. Thin muscular tubes which carry urine from kidney to urinary bladder-
5. Small sac-like muscular structures that encloses testes-
Match the parts of the given figure with the correct option.
V. Answer all the questions
8 x 5 = 40
What are the changes of state in water? Explain.
Draw a circuit with a 2\(\Omega\) and 5\(\Omega\) resistors in series. Connect another 3\(\Omega\) resistor parallel to the above connection.
Explain the principle, construction and working of a dc motor
State any five features of modern periodic table.
List down the differences between Ionic and Covalent compounds.
Plaster of Paris should be stored in a moisture proof container. why?
Write about the elements of Xylem
Explain the structure of kidney and the steps involved in the formation of urine