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2 (iv). Fill in the blanks:

Motion of the needle of a sewing machine is ______________.

2 (v). Fill in the blanks:

Motion of wheel of a bicycle is______________.

3. Why can a pace or a footstep not be used as a standard unit of length?

4. Arrange the following lengths in their increasing magnitude: 1 metre, 1 centimetre, 1 kilometre,1 millimetre.

5. The height of a person is 1.65 m. Express it into cm and mm.

6. The distance between Radha's home and her school is 3250 m. Express this distance into km.

7. While measuring the length of a knitting needle, the reading of the scale at one end is 3.0 cm and at the other end is 33.1 cm. What is the length of the needle?

8. Write the similarities and differences between the motion of a bicycle and a ceiling fan that has been switched on.

9. Why would you not like to use a measuring tape made of an elastic material like rubber to measure distance? What would be some of the problems you would meet in telling someone about a distance you measured with such a tape?

10. Give two examples of periodic motion.

1. Fill in the blanks : (a) A device that is used to break an electric circuit is called _______________.

1. Fill in the blanks :

(b) An electric cell has _______________ terminals.

2. Mark 'True' or 'False' for following statements: (a) Electric current can flow through metals.

2. Mark 'True' or 'False' for following statements:

(b) Instead of metal wires, a jute string can be used to make a circuit.

2. Mark 'True' or 'False' for following statements:

(c) Electric current can pass through a sheet of thermocol.

3. Explain why the bulb would not glow in the arrangement shown in Fig. 12.13.

4. Complete the drawing shown in Fig 12.14 to indicate where the free ends of the two wires should be joined to make the bulb glow.

5. What is the purpose of using an electric switch? Name some electrical gadgets that have switches built into them.

The central dogma of molecular genetics states that the genetic information flows :

Option: 1

Amino acids \rightarrow Proteins \rightarrow DNA


Option: 2

DNA \rightarrow Carbohydrates \rightarrow Proteins


Option: 3

DNA \rightarrow RNA \rightarrow Proteins


Option: 4

DNA \rightarrow RNA \rightarrow Carbohydrates


Which of the following pairs of hormones are not antagonistic (having opposite effects) to each other?

Option: 1

Parathormone  - Calcitonin


Option: 2

Insulin - Glucagon


Option: 3

Aldosterone - Atrial Natriuretic Factor


Option: 4

Relaxin - Inhibin


A normal- visioned man whose father was colour- blind, marries a woman whose father was also colour- blind. They have their first child as a daughter. what are the chance that this child would be colour- blind?

Option: 1

100%


Option: 2

zero percent


Option: 3

25%


Option: 4

50 %


The most abundant intracellular cation is:

Option: 1

K+


Option: 2

Na++


Option: 3

Ca++


Option: 4

H+


A rod PQ of mass M and length L is hinged at end P. The rod is kept horizontal by a massless string tied to point Q as shown in figure. When string is cut, the initial angular acceleration of the rod is:

 

Option: 1

\frac{2\text{g}}{3\text{L}}


Option: 2

\frac{3\text{g}}{2\text{L}}


Option: 3

g/L


Option: 4

2g/L


XeF2 is isostructural with:

Option: 1

BaCl2


Option: 2

TeF2


Option: 3

\text{ICl}_{2}^{-}


Option: 4

SbCI3


Some meta - directing substituents in aromatic substitution are given. Which one is most deactivating?

Option: 1

-NO2


Option: 2

-C\equivN


Option: 3

-SO3H


Option: 4

-COOH


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