Relation between HCF and LCM of 3 numbers

Q. Which of the following is best explanation for the given statement -
Polystyrene foam is used in insulating refrigerators and cold stores.

1. Polystyrene foam is heavy, thus, acts as a proper insulator.
2. Polystyrene foam is the cheapest among all other insulators.
3. When air is blown through molten polystyrene, it forms light foam, which is an excellent insulating and packaging material.
4. Polystyrene foam is biodegradable in comparison to rest polymeric insulators.

Q. Which amongst the following synthetic fibres is a good absorbent of water?

1. Nylon
2. Rayon
3. Polyester
4. Acrylic

Q. The square root of a perfect square containing ‘n’ digits has ___ digits.

1. $\frac{n+1}{2}$
2. $\frac{n}{2}$
3. A or B
4. None of these

Q.

Name the fibre obtained from coconut.

Q. If $\sqrt{1369}+\sqrt{0.0615+x}=37.25$, then $x$ is equal to

1. ${10}^{-2}$
2. ${10}^{-3}$
3. ${10}^{-1}$
4. $10$

Q. If a number of $n$-digits is perfect square and $n$ is an odd number, then which of the following is the number of digits of its square root?

1. $\frac{n}{2}$
2. $\frac{n+1}{2}$
3. $\frac{n-1}{2}$
4. $2n$

Q. Which of the following is the first artificial fibre ?

1. Artificial jute
2. Artificial silk
3. Artificial cotton
4. Artificial wool

Q. Which one of the following is a thermosetting plastic?

1. Polyethene
2. Bakelite
3. Acrylic
4. PET

Q. Identify the product based on the given features.
I. It is a man-made product.
II. It has a linear arrangement of monomer units.
III. It is used for making goods like toys, combs, containers, etc.

1. Jute
2. Rayon
3. Thermoplastics
4. Thermosets

Q. Which of the following is a Pythagorian triplet?

1. 12, 35, 37
2. 29, 31, 37
3. 15, 17, 21
4. 6, 8, 12

Q. Which of the following is a semi-synthetic fibre?

1. Nylon
2. Cellulose acetate
3. Polyester
4. Acrylic

Q. What is the square root of 4096?

1. 36
2. 64
3. 34
4. 26

Q. What is the smallest natural number which when added to the difference of squares of 17 and 13 gives a perfect square?

1. 1
2. 5
3. 11
4. 24

Q. Which of the following numbers is a perfect square?

1. 3857
2. 9842
3. 2061
4. 2448

Q. What is the square of 1.2?

1. 0.144
2. 1.44
3. 14.4
4. 144