Bakelite - Novolac is a correct match. Bakelite is a type of thermosetting plastic that was commonly made from the reaction of phenol and formaldehyde. Novolac refers to a specific type of phenolic resin that is used in the production of Bakelite.
Correct Answer:
Bakelite - Novolac
Explanation:
List II | List II |
---|---|
A. Elastomeric polymer | I. Urea formaldehyde resin |
B. Fibre Polymer | II. Polystyrene |
C. Thermosetting Polymer | III. Polyester |
D. Thermoplastic Polymer | IV. Neoprene |
Polymers used for making toys are?
A block of certain mass is placed on a rough floor. The coefficients of static and kinetic friction between the block and the floor are 0.4 and 0.25 respectively. A constant horizontal force \( F = 20 \, \text{N} \) acts on it so that the velocity of the block varies with time according to the following graph. The mass of the block is nearly (Take \( g = 10 \, \text{m/s}^2 \)):
A wooden block of mass M lies on a rough floor. Another wooden block of the same mass is hanging from the point O through strings as shown in the figure. To achieve equilibrium, the coefficient of static friction between the block on the floor and the floor itself is
The circuit shown in the figure contains two ideal diodes \( D_1 \) and \( D_2 \). If a cell of emf 3V and negligible internal resistance is connected as shown, then the current through \( 70 \, \Omega \) resistance (in amperes) is: