Question

1) Assertion: Some foul smell is developed when a packet of fried potato chips is kept open for a few days. This process is said to involve a chemical change. Reason: The change is said to be physical if the state and shape of the substance changes. *

1 point

both assertion and reason statements are correct and reason is also the correct explanation

both assertion and reason statements are correct but the reason is not the correct explanation

assertion is correct but the reason statement is wrong

assertion and reason ,both are wrong statements

2) Reema dissolved one teaspoon full of alum (phitkari) in a small amount of hot water taken in a cup and left it (step 1). After a few days, she found that water had disappeared and some shining crystals are formed(step 2). Step 1 and step 2 are : *
1 point
physical and chemical changes respectively
chemical and physical changes respectively
both are chemical changes
both are physical changes

3).A cold steel spoon dipped in a cup of hot milk. It transfers heat to the other end by the process of *
1 point
radiation
convection
conduction
none of these

4)Boojho and Paheli were given one mirror each by their teacher. Boojho found his image to be erect and of the same size, whereas Paheli found her image erect and smaller in size. This means that the mirrors of Boojho and Paheli are, respectively *
1 point
plane mirror and concave mirror
concave mirror and convex mirror
plane mirror and convex mirror
convex mirror and plane mirror


5) In the figure given below, identify the parts marked (i), (ii), and (iii) *
1 point
Captionless Image
pollen tube ,stigma, ovary
stigma , style , egg
pollen grain , pollen tube , zygote
pollen grain , zygote , pollen tube


6) Dipak does not have a night lamp in his room. He covered the bulb of his room with a towel in the night to get dim light. Has he taken the right step? Give one reason to justify your answer. *
1 point
no,because it results in the wastage of electrical energy
no,because due to excessive heat ,the towel may burn
both of the above
none


7)Four students made an electromagnet by winding 50,100,150,200 turns of copper wire over an iron screw. Which electromagnet will attract more pins? *
1 point
Captionless Image
A
B
C
D

8)In a tomato sauce, a sour taste is because of the presence of oxalic acid. What are the other acids found in the sauce? *
1 point
Captionless Image
acetic acid
citric acid
malic acid
all of these


9) Toothpaste contains a base that neutralizes the acids present on our teeth. What is it? *
1 point
Captionless Image
potassium
fluoride
sodium
copper

10) . A rainbow can be seen in the sky *
1 point
Captionless Image
when the sun is in front of you
when the sun is behind you
when the sun is overhead
only at the time of sunrise


11) . A curtain is hanging in the entrance of a room. A long corridor runs at right angles to the door, that is parallel to the curtain, If a strong wind blows along the corridor, the curtain will *
1 point
get pushed inside the room
get pushed outside the room
get collected towards one end
remain unaffected



please give all the & correctly Answers An ARMY should help another ARMY​

Answer 1

Explanation:

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