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Welcome to The Global Classroom Pvt. Ltd.

When Every Child Matters!

The Global Classroom carries the unique GEMS “Dynamic” materials and assessments of Dr Sunita Gandhi, Ph.D. Cambridge University, UK. These have been tested and tried in three countries, Iceland, India and the UK, and perfected with a three year trial with over 40,000 children in India participating.

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Covering Chapters
1.	Newton's Second Law of Motion	13.	Colours and Filters
2.	Work, Energy and Power	14.	Sound
3.	Machines as Force Multiplers, M.A., V.R	15.	Ohm's Law: e.m.f. and Potential Difference
4.	Efficiency	16.	Resistances in Series and Parallel
5.	Levers	17.	Electrical Power
6.	Pulleys	18.	Houehold Circuits
7.	Inclined Plane	19.	Magnetic Effect of Current
8.	Refraction of Light at a Plane Surface	20.	Electromagnetic Induction
9.	Total Internal Reflection and Critical Angle	21.	Calorimetry
10.	Refraction of Light Through a Lens	22.	Thermionic Emission
11.	Photograpic Camera and Eye	23.	Radioactivity
12.	Electromagnetic Spectrum	24.	Nuclear Energy

Questions

Questions 5 (b)
(i)	What is meant by gravitational potential energy?
(ii)	State the enrgy transformation in
(1)	A loud speaker.
(2)	Electric Press.

Questions 5 (c)
	A block and tackle system hac 5 pulleys. On applying an effort of 100N a load of 45 kgf can be lifted. Find
(i)	Velocity ratio
(ii)	Mechanical advantage and
(iii)	Efficiency of the system (Take g-10 m/s2)

Questions 8 (b)
10g of ice at 0° C is changed to water at 50°C. Calculate the amount of heat required given, Specific heat capacity of water = 4200 J/kg° C
Latent heat of fusion of ice = 336J/g

Questions 8 (c)
(i)	How does the wave form of a faint sound differ from that of a loud sound of the same pitch. Draw a suitable diagram.
(ii)	What is resonance? Give one example.

Questions 9 (a)
How does current drawn in a domestic connection increase when the number if appliances in the connection increases.

Questions 9 (b)
Using the adjoning diagram calculate,
(i)	Total resistance in the circuit.
(ii)	Value of the resistance R
(iii)	Current flowing in resistance R.

Solutions Tips and Guidelines

Solution 8 (b)
Heat is absorbed in two steps :

Formulae/ Tips :
(i)	Heat absorbed or released in the change of state =mL
(ii)	Heat absorbed or evolved in heating / cooling a substance = mcq
(iii)	A diagram of the type as given in the solution will be of help. So you should draw it
Solution : (a)
(i)
(ii)	Resonance ® A special case of forced vibration when the frequency of applied periodic force is equal to or an integral multiple of natural frequency of a body.
	Example of resonance - Resonance in a string or, a suspension bridge.

•	The MAXIM Classbook

•	GEMS Dynamic Assessments

•	PerBooks Personalised TopicBooks

•	Sure Success Series

•	TargetPLUS On-Line Mocks

•	UK GCSE Mock Papers for Mathematics

•	GEMS “Dynamic” at a Glance

•	Philosophy Behind GEMS “Dynamic”

•	GEMS “Dynamic” Surveys and Perbooks

•	GEMS “Dynamic” Reports

•	GEMS “Dynamic” Training

•	GEMS “Dynamic” Lab School?