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If the temperature increases, then what happens to the frequency of the sound produced by the organ pipe?

A Increases
B Decreases
C Unchanged
D Can’t say

An empty glass with a piece of cotton wool stuck into its bottom was lowered in an upside down position into a trough of water. In the experiment, the cotton wool did not get wet even when glass was fully submerged in water. The experiment demonstrates that


AAir has mass
BAir occupies space
CAir cannot be compressed
DBoth B and C.

A rectangular block of substance X has a length of 10 cm, breadth 5 cm and height 2 cm. The mass of the block is 0.027 kg. If density of water is 1 g/cm³ then, which of the following statements is correct?

AThe block will float in water as its density is 0.27 g/cm³.
BThe block will sink in water as its density is 2.7 g/cm³.
CThe block will sink in water as its density is 0.027 kg/cm³
DThe block will float in water as its density is 0.0027 g/cm³

Shuchi shone a ray of light onto sheet P as shown in the diagram. She found that a bright circle appeared only on sheet S. What can we deduce about the properties of sheets P, Q, R and S?


ASheet Q is made up of a translucent material.
BSheet R is made up of a translucent material.
CSheets R and S are made up of an opaque material.
DSheets P and S are made up of an opaque material.

Select an INCORRECT pair.

A
B
C
D

If an apple is sliced and kept for some time, the exposed slices of the apple turn brown. Find the correct option for the type of change and idea for preventing the apple from turning brown.

APhysical change and dip in water
BChemical change and sprinkle salt
CPhysical change and dip in lime juice
DChemical change and dip in lemon juice

______ is an outer planet of Solar System.

AEarth
BMars
CNeptune
DPluto

Select the correct mirror image of the given combination of letters and numbers.



A

B

C

D

Read the given statements.
(i) 'X' is caused by disturbances in the surface of earth.
(ii) Disturbance on sea bed results in 'Y'.
(iii) 'Z' is due to lack of rain and it results in famine and crop shortage.
Select the option which correctly identifies X, Y and Z.

Raj is shorter than ______ and taller than ______.


A Seema, Varun
B Megha, Ajay
C Seema, Megha
D Ajay, Megha