Science 1 Marks Question

convection

mercury

degree celcius

radiation

violet

dark - coloured

Maximum - minimum thertmometer

Thermometer

Light coloured clothes.

Does not become cold.
Its other end does not become cold as wood is a bad conductor of heat.

We use an umbrella to protect us from heat coming from the sun in the form of radiation.

Any utensil kept on flame, becomes hot because heat transfers from flame to the utensil.

Heat is a form of energy, entry or exit of which correspondingly increases or decreases internal energy of a body when no work is done on the body or by the body. It is measured in joule or calories.

Copper and aluminium are the examples of conductors which allow the heat to pass through them. While wood and plastic are the examples of insulators which do not allow the heat to pass through them.

Water kept in a black pot will cool faster because blackened surface is a good radiator than a silvered surface.

The thermometer used to measure human body temperature is called clinical thermometer.

Woollen clothes keep us warm during winter. It is so because wool is a poor conductor of heat and it has air trapped in between the fibres.

Since, with the help of ventilators, warm air being higher get rises up and leaves the room. Even the fresh air enters the room from outside through the doors and windows.

Kink prevents mercury level from falling on its own.

Temperature is measured in degree Celsius.

Aluminium, copper, iron etc.

At night, the water cools down more slowly than the land. So, the cool air from the land moves towards the sea. This is called the land breeze.

Since, the black bodies are better radiators, so due to this reason, radiators in cars are painted black.

Clothes of dark colours absorb heat better than clothes of light colours.

Heat flows from a hotter object to a colder object. The process by which heat is transferred from the hotter end to the colder end of an object is known as conduction.

When we come out in the sun, we feel warm.

The clinical thermometer consists of kink which prevents the mercury level from falling on its own.

Copper is a better conductor of heat than the stainless steel.

Temperature of boiling water cannot be measured by a clinical thermometer.

The property of thermal expansion of liquids is used in making thermometers. It states liquid expands on heating and contracts on cooling.

A kink near the bulb of a clinical thermometer prevents mercury level from falling of its own.

Temperature is the measure of hotness of an object.

Since, we know that gunny bags consist of number of fine pores which are filled with air. As air is a bad conductor of heat, so due to this reason, it does not allow the external heat to move inside and melts the ice.

37°c.

Temperature of other object is measured with laboratory thermometer because clinical thermometer is not suitable for higher temperature.

Not.

In coastal areas, cold air flows in the day from sea to land. It is called sea breeze.

This is because the hot air from the candle rises up and is hotter whereas on the sides, there is no hot air.

Convection.

The molecules in gases are more loosely packed than liquids so, they move more freely and expand more.

Window should preferably towards the sea beach so that the sea breeze coming from sea keeps the house cool during the day time.

Not flow from iron ball to water or from water to iron ball.
The heat will not flow from iron ball to water or from water to iron ball as both the substances have same temperature.

The kink in the capillary tube of the thermometer allows mercury to rise but does not allow it to fall.