Rachit added a teaspoonful of vinegar and a pinch of
baking soda in a test tube. He heard a hissing sound
and saw bubbles of a gas coming out. He passed this
gas through lime water. Which of the following is
incorrect about his experiment?
A Lime water turns milky.
B The gas evolved was carbon dioxide.
C Sodium hydrogencarbonate is formed which makes lime water milky.
D Both b and c
Answer is c
X is easily broken down by decomposers and Y cannot be broken down by decomposers.
Identify X and Y.
A X - Ceramic, Y - Plastic
B X - Wood, Y - Clothes
C X - Paper, Y - Metal
D X - Vegetables, Y - Wood
wrong options given.how can plastic be decomposed and metal can not?
Deep inside the Earth there is hot molten rock called
'P'. This comes up and collects in a chamber. When
'P' erupts through the Earth's surface, it is called 'Q'.
On cooling, it becomes 'R'. The hollow top of the
volcano that is shaped like a bowl, is called a 'S'.
Which of the following is incorrect regarding the above passage?
A 'Q' is magma and 'P' is lava. When magma is below the Earth's surface it is called lava.
B 'R' are igneous rocks. The first rocks to form on the Earth were igneous rocks.
C 'S' is a vent, an opening or a crack in the crust of the Earth.
D Both A and C.
Refer to the given figure indicating three types of forces, X, Y and Z and select the incorrect option.
AAn astronaut floats in space due to absence of force Z.
BWhen we use pulley to lift a bucket of water from well (pulling vertically downward) then pulley makes X in opposite direction of Z making it easier to lift the bucket.
CForce Y is responsible for wearing and tearing of tyres of vehicles.
DWe can walk only on those surfaces which offer no Y.
Madhu was asked to write names of some Rabi crops but she also wrote some Kharif crops. Select the Kharif crops written by Madhu from the following.
Wheat, Rice, Mustard, Maize, Gram
AWheat, mustard, legumes
DMustard, maize, legumes
i think rice, maize and wheat would be the kharif crops that grow during the period of summer season.so the answer options (B) (C) both can be right.
Ritu took two bimetallic strips, I and II (of equal size, length and breadth) made up of metals P and Q; and Q and R, respectively as shown here.
She subjected each bimetallic strip to heating for same time period. The given diagram shows her experiment.
Which of the following cannot be inferred from the above experiment?
AMetal P expands more as compared to metals Q and R on heating for the same time period.
BMetal R contracts more as compared to metals P and Q on heating for the same time period.
CThe ascending order of expansion of these metals when subjected to heating is R < Q < P.
DBoth B and C
The events below show what happens when a seed germinates.
1. The shoot appears.
2. The root appears.
3. The first leaf appears.
4. The seed coat breaks.
Which of the following represents the correct sequence of these events?
A 2, 1, 3, 4
B 2, 1, 4, 3
C 4, 1, 2, 3
D 4, 2, 1, 3