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Changes occurring in the following figures are :



AReversible , Permanent
BReversible , Reversible
CPermanent , Reversible
DPermanent , Permanent

Read the given statements and select the correct option.
Statement 1 : When an electric current flows through a wire, it behaves like a magnet.
Statement 2 : A current carrying coil of an insulated wire wrapped around an iron nail forms an electromagnet.

ABoth statements 1 and 2 are true and statement 2 is the correct explanation of statement 1
BBoth statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1
CStatement 1 is true but statement 2 is false
DBoth statements 1 and 2 are false

A compound is prepared from gypsum upon heating to a temperature of 373 K and it changes back to gypsum on adding water. Which is the incorrect statement about the compound?

A The compound is used for setting fractured bones.
B The compound is called plaster of Paris which is calcium sulphate dihydrate with a formula CaSO₄.2H₂O.
C If heated at higher temperature, the compound becomes dehydrated and is called dead burnt plaster.
D Both (A) and (B).

Which statement is incorrect for LPG?

AIt can be compressed, but cannot be bent.
BIt occupies space.
CIt has fixed volume and shape.
DIt exerts pressure.

Television converts

AElectrical energy into kinetic energy.
BElectrical energy into sound and light energy.
CMechanical energy into electrical and sound energy.
DMechanical energy into light and sound energy.

Refer the given figure and answer

Which of the following processes is occuring at ?

ACondensation
BEvaporation
CTranspiration
DPrecipitation

Read the given statements and select the option that correctly identifies them as true (T) and false (F) ones.
(i) Llama and alpaca are breeds of wool yielding camels.
(ii) Cocoon of silkworm secretes fibre made of protein which hardens on exposure to air and becomes silk fibre.
(iii) Anthrax is an occupational disease of wool industry caused by Bacillus anthracis.

The bulb of a mercury thermometer is placed first in melting ice (at standard pressure), then in steam (at standard pressure), and at last in a liquid X. The lengths of mercury thread in the uniform tube above bulb, in the three cases, are 30 mm, 180 mm, and 60 mm respectively. What is the temperature of X ?

A20°C
B40°C
C29.4°C
D33.3°C

Which of the following statements is correct about dicotyledons?

A Their root system consists of fibrous roots only.
B Their leaves have parallel venation.
C The vascular bundles in their stems are arranged in a ring.
D Their flowers are trimerous.

Which of these illustrates sea breeze?

A
B
C
D