Grade 7 Science Asset

A sieve has holes of size 1 sq mm. Which of the following can be separated using this sieve?

• Rice powder and dal

• Lemon juice and water

• Wheat flour and turmeric powder

• Sugar from sugar solution

What can this instrument directly measure? 1. length 2. speed 3. thickness 4. temperature

• Only 2

• Only 1

• Both 3 and 4

• Both 1 and 3

Where will you find the symbol shown above?

• On a box containing glasses

• On a box with a knife

• On a bottle of acid

• In front of a manhole on a road

Priyanka has a mosquito coil as shown above. She has to make a similar looking coil in her craft class using a wire. She needs to call her father on the phone and ask him to buy a certain length of wire. She has a ruler, a pencil and a thread with her. Which of these does she need to use, to measure the length of the coil?

• Only a ruler

• Only a thread

• A ruler and a thread

• A pencil and a thread

What is the approximate length of the WASP'S WING?

• 2.5 cm

• 1.5 cm

• 4 cm

• 2 cm

Vishal found two almost identical jugs. He wanted the one that would hold more water. Which jug will hold more water?

• Both jugs will hold the same amount of water.

• Jug 1

• Jug 2

• It depends on the material of the jug.

What is the mass of the solution when 500 grams of salt is dissolved in 20 litres of water? ( Mass of 1 litre of water is 1 kilogram)

• Less than 20.5 kg

• Equal to 20.5 kg

• Slightly greater than 20.5 kg

• Depends on the volume of salt

As a precaution while heating a solution in a test tube, you should .

• Hold the test tube with two fingers so that it remains stable

• Smell the liquid to check whether its property is changing

• Hold the test tube in such a way that the solution is directly visible

• Point the test tube away from you so that the liquid does not splash up on you

When two magnets are placed inside each other's magnetic fields, the like poles repel and the unlike poles attract. The Earth acts like a giant magnet. Any free bar magnet on Earth aligns itself in such a way that its North pole points as shown in the figure. Where is the north pole of the giant magnet Earth?

• Option C

• Option B

• Option A

• Option D

An earthen pot is made of mud and has numerous pores in it. If water is filled in the pot, tiny amounts of water come out from these pores, keeping the outer surface slightly moist. After a few hours, the water in the pot becomes refreshingly cold. This happens due to a certain phenomenon. In which of these is the same phenomenon responsible for the effect seen?

• Sweat evaporates on absorbing heat from the body and makes the body cooler.

• Water droplets condense on the outer surface of a cold bottle kept in an open room.

• Water starts boiling when heated at 100 degree celsius.

• Dew drops appear on cooler surfaces in the early morning.