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
Heat
Similarities
Differences
Conductors: Silver and Copper
Insulators: Paper and wood
(a) The hotness of an object is determined by its __________.
(b) Temperature of boiling water cannot be measured by a _____________ thermometer.
(c) Temperature is measured in degree ______________.
(d) No medium is required for transfer of heat by the process of __________.
(e) A cold steel spoon is dipped in a cup of hot milk. Heat is transferred to its other end by the process of ______________.
(f ) Clothes of ______________ colours absorb more heat better than clothes of light colours.
(a) The hotness of an object is determined by its temperature.
(b) Temperature of boiling water cannot be measured by a clinical thermometer.
(c) Temperature is measured in degree Celcius.
(d) No medium is required for transfer of heat by the process of radiation.
(e) A cold steel spoon is dipped in a cup of hot milk. Heat is transferred to its other end by the process of conduction.
(f ) Clothes of darkcolours absorb more heat better than clothes of light colours.
(i) Land breeze blows during | (a) summer |
(ii) Sea breeze blows during | (b) winter |
(iii) Dark coloured clothes are preferred during | (c) day |
(iv) Light coloured clothes are preferred during | (d) night |
(i) The land breeze blows during | (d) night |
(ii) The sea breeze blows during | (c) day |
(iii) Dark coloured clothes are preferred during | (b) winter |
(iv) Light coloured clothes are preferred during | (a) summer |
More layers of clothing during winter keeps us warmer because as they have a lot of space between them and air gets trapped between layer. As air is a bad conductor of heat it does not allow the escape of the heat out of the body.
In places of hot climate, it is advised that the outer walls of houses be painted white because white colour is best reflected colour and poor absorber of heat. So the houses do not heat up too much
(a) 80°C (b) more than 50°C but less than 80°C
(c) 20°C (d) between 30°C and 50°C
between 30°C and 50°C .
(a) flow from iron ball to water.
(b) not flow from iron ball to water or from water to iron ball.
(c) flow from water to iron ball.
(d) increase the temperature of both.
(b) not flow from iron ball to water or from water to iron ball
(a) becomes cold by the process of conduction.
(b) becomes cold by the process of convection.
(c) becomes cold by the process of radiation.
(d) does not become cold.
(d) does not become cold because wood is a bad conductor of heat.
(a) copper bottom makes the pan more durable.
(b) such pans appear colourful.
(c) copper is a better conductor of heat than stainless steel.
(d) copper is easier to clean than stainless steel.
(c) copper is a better conductor of heat than the stainless steel.
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