The question asks to identify the white powder formed when a magnesium ribbon burns. This is a classic example of a combustion reaction where a metal reacts with oxygen from the air.
D) Magnesium oxide is the white powder formed when magnesium ribbon burns in air, as it is the product of the combustion reaction between magnesium and oxygen.
The problem involves decoding a pattern in a given word and applying the same pattern to a new word. We need to identify the rule by which 'CORNER' is coded as 'GSVRIV' and then apply that rule to 'CENTRAL'.
The pattern observed is that each letter in the word 'CORNER' is shifted forward by 4 positions in the alphabet to get its coded letter.
C) GIRXVEP is the correct code for 'CENTRAL' based on the identified pattern.
The question asks to identify the hormone released during an emergency situation. This relates to the body's 'fight or flight' response, which is mediated by specific hormones produced by the adrenal glands.
A) Adrenaline — Adrenaline (epinephrine) is the main hormone released by the adrenal medulla in response to stress, fear, or excitement. It prepares the body for immediate action, often referred to as the "fight or flight" response, by increasing heart rate, blood pressure, and energy availability.
The question asks for the date of the First Battle of Panipat. This is a direct factual recall question from Indian history, specifically related to the Mughal Empire's establishment.
The First Battle of Panipat was a pivotal conflict that marked the beginning of the Mughal Empire in India. It was fought between the invading forces of Babur and the Lodi dynasty under Ibrahim Lodi.
This battle took place in the year 1526.
D) 1526 — The First Battle of Panipat was indeed fought on April 21, 1526, between Babur and Ibrahim Lodi. Babur's victory in this battle established the Mughal Empire in India.
To find the percentage increase in the area of a circle when its radius increases by a certain percentage, we first calculate the initial and final areas. Then, we use the formula for percentage increase.
B) 10.25% is the correct answer, as calculated above.
The question asks to identify an alloy composed of copper and zinc. This requires knowledge of common alloys and their constituent elements.
B) Brass is an alloy primarily composed of copper (Cu) and zinc (Zn). It is widely used for its strength, corrosion resistance, and aesthetic appeal, often found in musical instruments, decorative items, and plumbing fixtures.
The problem presents an analogy based on letter sequences. We need to identify the pattern or relationship between the first pair of letter sequences (BFIJ : DHKL) and then apply the same pattern to the third sequence (LOQT) to find the missing fourth sequence.
Let's examine the position of each letter in the alphabet.
The pattern is that each letter in the first sequence is shifted forward by 2 positions in the alphabet to get the corresponding letter in the second sequence.
Now, we apply the same +2 shift to each letter in LOQT.
Therefore, LOQT : NQSV.
Correct Option: B) NQSV
The question asks to identify the hardest known substance among the given options. This requires knowledge of the properties of different carbon allotropes and common metals.
Correct Option: A) Diamond is the hardest natural substance known. Its exceptional hardness is due to its strong covalent bonding and rigid crystal lattice structure.
The question asks for the term that defines "thrust on unit area". This is a fundamental definition in physics, specifically in mechanics and fluid dynamics. We need to recall the definitions of the given options and identify the one that matches the description.
Correct Option: D) Pressure is defined as the force (thrust) acting perpendicularly on a unit area. Its SI unit is Pascal (Pa), which is equivalent to Newtons per square meter (\(\text{N/m}^2\)).
The problem asks us to identify the odd one out from a given set of English alphabet letters. This type of question usually involves looking for a common property among most of the options and identifying the one that does not share that property. We will examine each letter for characteristics like straight lines, curves, number of lines, or symmetry.
B) S — The letter 'S' is the only option that is formed exclusively using curves. The other letters (V, X, T) are all formed using only straight lines.