Tag: evs

Questions Related to evs

A block of aluminium of density 2.75 $ \displaystyle g/cm^{3} $ has a volume of 30$ \displaystyle cm^{3} $. The mass of the block is:

evs nature of things properties of materials grouping and classification of objects sorting materials into groups

  1. $27$ gm

  2. $18 $ gm

  3. $82.5$ gm

  4. $810$ gm

Show answer
Correct Option: C
Explanation:

Mass $=$ Density $\times$ Volume

So, Mass of aluminium $=2.75 \times 30 = 82.5\  gm$
Hence, option $C$ is correct.

A block of wood has mass 200 kg. If the density of wood is 800 $ \displaystyle kg/m^{3} $, its volume will be:

evs nature of things properties of materials grouping and classification of objects sorting materials into groups

  1. 0.25 $ \displaystyle  m^{3} $

  2. 25 $ \displaystyle  m^{3} $

  3. 250$ \displaystyle  cm^{3} $

  4. none of these

Show answer
Correct Option: A
Explanation:
Volume = Mass/ Density
So, volume of wood = 200/800 = 0.25 $m^3$

Identify the materials from the following which float in water: 

evs nature of things properties of materials grouping and classification of objects sorting materials into groups

  1. wax, iron nails, sponge

  2. plastic, wood, oil

  3. ice, oil, sand

  4. honey, thermocol, keys

Show answer
Correct Option: B
Explanation:

Things which are lighter than water or less dense than water will not sink in water eg. plastic, wood, and oil.

Opaque objects:

evs nature of things properties of materials grouping and classification of objects sorting materials into groups

  1. does not transmit most of the light falling on them

  2. transmit most of the light falling on them

  3. absorb most of the light falling on them

  4. are strong and hard

Show answer
Correct Option: C
Explanation:

An opaque object is neither transparent (allowing all light to pass through) nor translucent (allowing some light to pass through). When light strikes an interface between two substances, in general, some may be reflected, some absorbed, some scattered, and the rest transmitted. 

Transparent substances:

evs nature of things properties of materials grouping and classification of objects sorting materials into groups

  1. absorb all the light incident on them.

  2. allow light to pass through them.

  3. do not allow light to pass through them.

  4. allow light to pass through them only partially.

Show answer
Correct Option: B
Explanation:

Transparent substances allows the light to pass through them. Due to this it is possible to see through the transparent substances. 

Example: We are able to see through the some glasses because they are transparent.

Who are the people left behind in the village after families migrate for work?

evs on the move again various farming seasons and communities farming seasons and migration of communities seasons in india

  1. The old and the ill people

  2. Children

  3. Unemployed

  4. All of these

Show answer
Correct Option: D

During what time of the year did Dhanus family get work in the village?

evs on the move again various farming seasons and communities farming seasons and migration of communities seasons in india

  1. Till Dussera

  2. During summer

  3. After winter season

  4. None of these

Show answer
Correct Option: A
Explanation:

Till Dussera Dhanus family get work in the village. During summer and after winter season they do not work because there is no rain in rest of the month so n work in the field. With the help of new irrigation method like tube-well and canals they can work. 

Hence , option A is correct.

This is an example of a very old viable seed excavated from Arctic Tundra. The seed germinated and flowered after an estimated record of $10,000$ years of dormancy. It is?

evs the journey of seeds vegetative propagation and seed dispersal seed dispersal seed dispersal and its methods other modes of vegetative propagation introduction to reproduction vegetative reproduction

  1. Victoria

  2. Lupinus arcticus

  3. Phoenix dactylifera

  4. Strobilanthus kunthiana

Show answer
Correct Option: B
Explanation:

There are several records of very old yet viable seeds. The oldest one is of a lupine(Lupnius arcticus) excavated from Arctic Tundra. Seeds of Lupinus arcticus, atleast $10,000$ years old were found in lemming burrows deeply buried in permanently frozen silt of Pleistocene age in ungladated central Yuzon. They readily germinated in the laboratory and have since grown into normal healthy plants.

Parachute type of mechanism of seed dispersal is found in _____________.

evs the journey of seeds vegetative propagation and seed dispersal seed dispersal seed dispersal and its methods other modes of vegetative propagation introduction to reproduction vegetative reproduction

  1. Pea/Leguminosae

  2. Mustard/Cruciferae

  3. Cotton/Malvaceae

  4. Taraxacum/Compositae

Show answer
Correct Option: D

Pappus occurs in compositae for

evs the journey of seeds vegetative propagation and seed dispersal seed dispersal seed dispersal and its methods other modes of vegetative propagation introduction to reproduction vegetative reproduction

  1. Air pollination

  2. Air dispersal

  3. Insect pollination

  4. Animal dispersal

Show answer
Correct Option: B