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A Double-ended queue supports operations such as adding and removing items from both the sides of the queue. They support four operations like addFront(adding item to top of the queue), addRear(adding item to the bottom of the queue), removeFront(removing item from the top of the queue) and removeRear(removing item from the bottom of the queue). You are given only stacks to implement this data structure. You can implement only push and pop operations. What are the total number of stacks required for this operation?(you can reuse the stack)
A double-ended queue supports operations like adding and removing items from both the sides of the queue. They support four operations like addFront(adding item to top of the queue), addRear(adding item to the bottom of the queue), removeFront(removing item from the top of the queue) and removeRear(removing item from the bottom of the queue). You are given only stacks to implement this data structure. You can implement only push and pop operations. What’s the time complexity of performing addFront and addRear? (Assume ‘m’ to be the size of the stack and ‘n’ to be the number of elements)
Metal 'A' displaces metal 'B' from its salt solution, but not able to displace metal 'C' from its salt solution. Metal 'B' displaces metal 'D' from its salt solution. Which of the following depicts correct order of reactivity of metals. 
Match the following  (a) a non-metal that exists in two forms (i) Chlorine (b) a non-metal which is liquid at room temperature   (ii) Zinc (c) a metal which is constituent of brass and bronze (iii) Carbon (d) a non-metal used for disinfecting water (iv) Bromine (e) a metal used in electroplating (v) Copper
Consider the figures of a metal ball and a metal ring given below.
The metal ball can just pass through the hole of a metal ring formed out of a strip. When the ball is heated it gets stuck. But when the metal is heated
Heat and Thermodynamics mcq question image
Consider the following statements about Metal Work of Punjab?
1. Amritsar is famous for metal work.
2. Decorative items like lamp shades and engraved metal doors are some of the items on which artisans work.
3. Metal work mostly done in village area.
Which of the statement(s) given above is/are correct?
The recrystallization behaviour of a particular metal alloy is specified in terms of recrystallization temperature, which is typically 1/3rd of the absolute melting temperature of a metal or an alloy and depends on several factors including the amount of 1. cold working and purity of the metal and alloy 2. hot working and purity of the metal and alloy Which of the above is/are correct?
If a 1 kg of metal having 25% of zinc and rest is copper is mixed with 5 kg of metal having 40% zinc and rest is other ‘P' metal. What is the ratio of three elements(Zinc, Copper & 'P' metal) in the resulting mixture?
Industries require a metallic sphere of 8 cm made of metal A. The cost of making the sphere with metal A and B are Rs. 320 and Rs. 40 respectively. (Cost is proportional to the volume). In the market, 30% profit is advised. A dealer claims that he can provide the industry at 10% lesser than the market price. He accomplishes that by making the sphere with 4 cm of inner sphere with metal B and remaining volume with metal A. What is the original profit (%) he earned (Approximated to nearest integer)?
When a metal X is placed in blue vitriol solution it change blue color solution into green and a red-brown coating of metal Y is formed on metal X. Metal X and Y are: