CAT Practice Question and Answer

Q: Which compound is a nonelectrolyte? 1805 0

  • 1
    C2H6O
    Correct
    Wrong
  • 2
    HCl
    Correct
    Wrong
  • 3
    Na2CO3
    Correct
    Wrong
  • 4
    NaCl
    Correct
    Wrong
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Answer : 1. "C2H6O"
Explanation :

Answer: A) C2H6O Explanation: C2H6O is a Non-electrolyte.   An electrolyte is a compound that conducts an electric current when it is in an aqueous solution or melted. In order to conduct a current, a substance must contain mobile ions that can move from one electrode to the other. All ionic compounds are electrolytes. When ionic compounds dissolve, they break apart into ions which are then able to conduct a current ( conductivity ). Even insoluble ionic compounds such as CaCO 3 are electrolytes because they can conduct a current in the molten (melted) state.   A nonelectrolyte is a compound that does not conduct an electric current in either aqueous solution or in the molten state. Many molecular compounds, such as sugar or ethanol, are nonelectrolytes. When these compounds dissolve in water, they do not produce ions.   Electrolytes are of 3 types ---- Strong Electrolytes, Weak Electrolytes and Non Electrolytes.   Strong Electrolytes ---- Compounds which completely dissolves. ( NaCl, Na2Co3, HCl ) Weak Electrolytes ----- Compounds which do not completely dissolves. Non Electrolytes ------ Compounds which do not dissolves at all.

Q: Simplify the following : 4 15 × 3 13 + ? = 20% of 120 1247 0

  • 1
    10
    Correct
    Wrong
  • 2
    24
    Correct
    Wrong
  • 3
    36
    Correct
    Wrong
  • 4
    40
    Correct
    Wrong
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Answer : 1. "10"
Explanation :

Answer: A) 10 Explanation: Given equation can be written as 215 x 103 + ? = 24=> 14 + ? = 24=> ? = 24 - 14=> ? = 10

Q: The day before yesterday, I was 25 years old, and next year I will turn 28. How is it possible? 3851 0

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Answer :
Explanation :

On carefully inspecting this question, one can understand that there are two days which are important and these are: A. My Birthday. B. The day when I am making this statement. If you think for a while, you will understand that such statements can be made only around the year’s end. So, if my birthday is on 31 December, then I will be making this statement on 1 January. I will further explain using the following example: 1. Consider that today is 01 January 2017. 2. Then, the day before yesterday was 30 December 2016 and according to the question I was 25 then. 3. Yesterday was 31 December 2016, which happens to be my birthday too (Woohoo!), and my age increases by one to become 26. 4. I will turn 27 on my birthday this year (31 December 2017). 5. I will turn 28 on my birthday next year (31 December 2018). Now, if you read the question again, it will make more sense:   The day before yesterday(30 December 2016), I was 25 years old and next year(31 December 2018) I will be 28.

Q: Which of the following is not a plantation crop? 1501 0

  • 1
    rubber
    Correct
    Wrong
  • 2
    coffee
    Correct
    Wrong
  • 3
    gram
    Correct
    Wrong
  • 4
    coconut
    Correct
    Wrong
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Answer : 3. "gram"
Explanation :

Answer: C) gram Explanation: Gram is not a Plantation crop among the given options.   Plantation crops are known as cash crops. These crops are mostly grown at tropical and subtropical areas. These crops are grown for sale but not for local consumption. such crops include rubber, coffee, tea, various oil seeds, sugar cane,etc. So, Gram is not a plantation crop.

Q: Which one of the following is not a prime number? 1682 0

  • 1
    91
    Correct
    Wrong
  • 2
    71
    Correct
    Wrong
  • 3
    41
    Correct
    Wrong
  • 4
    31
    Correct
    Wrong
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Answer : 1. "91"
Explanation :

Answer: A) 91 Explanation: Prime Numbers :: Numbers which are divisible by only 1 and itself are Prime Numbers.   It's answer will be 91. Because 91 can be divisible by 7,13,91,1. It is quite clear that prime number should be divisible only by itself and by 1.

Q: Find the next number in the number series? 1, 4, 12, 32, ? 1919 0

  • 1
    80
    Correct
    Wrong
  • 2
    100
    Correct
    Wrong
  • 3
    192
    Correct
    Wrong
  • 4
    169
    Correct
    Wrong
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Answer : 1. "80"
Explanation :

Answer: A) 80 Explanation: Next number of the sequence 1, 4, 12, 32,... 1 = 2 x 20 4 = 2 x 21 12 = 3 x 22 32 = 4 x 23 80 = 5 x 24.

Q: Which of the following is not a pure substance? 2152 0

  • 1
    Oxygen
    Correct
    Wrong
  • 2
    Carbon dioxide
    Correct
    Wrong
  • 3
    Water
    Correct
    Wrong
  • 4
    Milk
    Correct
    Wrong
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Answer : 4. "Milk"
Explanation :

Answer: D) Milk Explanation: Milk is not a pure substance since it has so many constituents that can be separated physically. Compounds are pure substances formed from elements unlike mixtures.

Q: Lethargic : Vital :: Trite : ? 8329 0

  • 1
    Unique
    Correct
    Wrong
  • 2
    Slug
    Correct
    Wrong
  • 3
    Lazy
    Correct
    Wrong
  • 4
    Skinny
    Correct
    Wrong
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Answer : 1. "Unique"
Explanation :

Answer: A) Unique Explanation: Lethargic means "sluggish", kind of inactive Vital means full of energy, lively So, they are antonyms. So, for the 2nd part of the analogy, you are looking for a antonym to trite Trite means lacking originality or freshness. Overused. Kind of like a cliche So, an antonym could be original, unique, innovative.

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