Chapter 1: Nutrition in Plants
Chapter 2: Nutrition in Animals
Chapter 5: Acids, Bases and Salts
Chapter 6: Physical and Chemical Changes
Chapter 7: Weather, Climate and Adaptations of Animals to Climate
Chapter 8: Winds, Storms and Cyclones
Chapter 10: Respiration in Organisms
Chapter 11:Transportation in Animals and Plants
Chapter 12:Reproduction in Plants
Chapter 14: Electric Current and Its Effects
Chapter 16:Water: A Precious Resource
Motion and Timers
i) Magnetic effect
ii)Heating effect
When ever current flow in wire it produce magnetic field around it So when we place compass near it needle get deflect due that field.
No , As circuit is not compelet so there in no flow of current it mean no magnetic field produce . If there is no magnetic field then compass needle do not show deflection
(a) Longer line in the symbol for a cell represents its terminal.
(b) The combination of two or more cells is called a .
(c) When current is switched ‘on’ in a room heater, it .
(d) The safety device based on the heating effect of electric current is called a .
(a) Longer line in the symbol for a cell represents its positive terminal.
(b) The combination of two or more cells is called a battery .
(c) When current is switched ‘on’ in a room heater, it produces heat .
(d) The safety device based on the heating effect of electric current is called a fuse .
(a) To make a battery of two cells, the negative terminal of one cell is connected to the negative terminal of the other cell. (T/F)
(b) When the electric current through the fuse exceeds a certain limit, the fuse wire melts and breaks. (T/F)
(c) An electromagnet does not attract a piece of iron. (T/F)
(d) An electric bell has an electromagnet. (T/F)
a) False
b) True
c) False
d) True
No, because plastic bags are not magnetic materials.It can not be attracted by magnet so magnet cannot be used to separate plastic bags from a garbage heap.
No ,It is not a good idea to replace fuse by a piece of wire because fuse has very low melting point compare to wire.Whenever current get overload fuse melt and break the circuit to prevent short circuits.
the possible defects in the circuit may be bulb fused , may be wire should not connect properly, switch not work properly etc If Zubeda will check these then may be bulb will glow.
(i) Would any of the bulb glow when the switch is in the ‘OFF’ position?
(ii) What will be the order in which the bulbs A, B and C will glow when the switch is moved to the ‘ON’ position?
i) No, the bulb will not glow
ii)All the bulbs glow simultaneously.
Chapter 1: Nutrition in Plants
Chapter 2: Nutrition in Animals
Chapter 5: Acids, Bases and Salts
Chapter 6: Physical and Chemical Changes
Chapter 7: Weather, Climate and Adaptations of Animals to Climate
Chapter 8: Winds, Storms and Cyclones
Chapter 10: Respiration in Organisms
Chapter 11:Transportation in Animals and Plants
Chapter 12:Reproduction in Plants
Chapter 14: Electric Current and Its Effects
Chapter 16:Water: A Precious Resource