The correct answer is citric.

• Orange juice contains citric acid due to which tastes sour.

Key Points

• Fruits that contain citric acid are called citrus fruits.
• Citrus fruits are lemon, lime, orange, Grapefruit, etc.
• The formula of citric acid is C₆H₈O₇.

Additional Information

• Oxalic acid is found in tomato.
  • Its formula is C₂H₂O₄.
• Formic acid is found in the sting of ants and bees.
  • Its formula is CH₂O₂.
• Acetic acid is found in vinegar.
  • Its formula is id CH₃COOH.

The correct answer is Left

Explanation:

By default, Excel aligns numbers to the right and text to the left.

Additional Information To align the text  

• Select the cells that have the text you want aligned.
• On the Home tab choose one of the following alignment options:
• To vertically align text, pick Top Align, Middle Align, or Bottom Align.
• To horizontally align text, pick Align Text Left, Center, or Align Text Right.
• When you have a long line of text, part of the text might not be visible. To fix this without changing the column width, click Wrap Text.
• To center text spanning several columns or rows, click Merge & Center.

The correct answer is Ajit Singh.

Key Points

• Ajit Singh-
  • He was the son of Jaswant Singh.
  • His stepmother was Gora Dhai.
  • He was the king of Marwar at the time of Aurangzeb's death in 1707 AD.
  • He also participated in the Debari Pact.

Additional Information

•  Uday Singh-
  • Akbar gave him the Mota Raja title.
  • He was the first Marwar ruler who established matrimonial relations with the Mughals.
• Chandrasen-
  • He was the son of Maldev.
  • He went to Akbar's Nagore darbar in 1570 AD.
  • He is also known as The forgotten hero of Marwar/ Pratap's Forerunner.
  • He did not accept Akbar's subjugation till his death.
• Maldev-
  • His father was Ganga Rathore and his mother was Queen Padmavati of Sirohi.
  • He killed his father so he is known as the father killer of Marwar.
  • He fought the battle of Giri-Sumel with Afghan ruler Sher Shah Suri.

It has an operating speed far slower than that of the primary storage is true for auxiliary storage.

Concept:-

Auxiliary Storage:- It is any storage that is made available to the system through input/output channels. Auxiliary Storage may also be referred to as secondary storage. The best example of auxiliary storage is hard disk drives and optical storage media like CD_S, DVDs, and Blu-ray. Other auxiliary storage belongs to the peripheral devices category as well, such as flash drives and any type of memory card.

Important Points

• An auxiliary memory is referred to as the lowest-cost, highest-space, and slowest-approach storage in a computer system.
• The most typical auxiliary memory devices used in computer systems are magnetic disks and tapes.
• Auxiliary storage serves two main purposes: it serves as an extension of the main memory or as a medium to permanently archive information.

From the given information,

1) The step number, on which A is standing, is two less than that of C.

2) Step number on which B is standing is one more than that of D.

If there are two steps in between the steps on which A and D are standing and C is standing on Step 6,

A is standing on Step 4.

Hence, A is standing on Step 4 is the correct answer.

 Indus Valley Civilization

• Indus Valley Civilization was one of those early urban civilizations that were originated in 2300 BC and were developed in the river basins of Sutlej, Ravi, and Indus.
• Indus Valley Civilization peoples cultivate many crops such as Barley, Wheat, Melon seeds, and oil crops like Sesame, Mustard, and Dates. These were traded by farmers with other people. 
• The most typical Indus seal is square, with a set of symbols along the top, an animal in the centre, and one or more symbols at the bottom.  

Seals

• The unicorn is the most common motif on Indus seals and appears to represent a mythical animal that Greek and Roman sources trace back to the Indian subcontinent. A relatively long inscription of eight symbols runs along the top of the seal. Hence option 3 is correct.

 Additional Informationhttps://www.harappa.com/indus/25.html#:~:text=The%20unicorn%20is%20the%20most,the%20top%20of%20the%20seal.

• Archaeologists have discovered thousands of seals, mostly made of steatite, and occasionally of agate, chert, copper, faience and terracotta, with beautiful figures of animals, such as unicorn bull, rhinoceros, tiger, elephant, bison, goat, buffalo, etc.
• The realistic rendering of these animals in various moods is remarkable. The purpose of producing seals was mainly commercial.
• It appears that the seals were also used as amulets, carried on the persons of their owners, perhaps as modern-day identity cards. The standard Harappan seal was a square plaque 2×2 square inches, made from steatite.
• Every seal is engraved in a pictographic script which is yet to be deciphered. Some seals have also been found in ivory.
• They all bear a great variety of motifs, most often of animals including those of the bull, with or without the hump, the elephant, tiger, goat and also monsters.