Question

statement (1): Invar steel is used to prepare clock pendulum.
Statement (2): The coefficient of linear expansion of invar steel is Infinity.
(A) statement 1 and statement 2 are correct and statement 2 is correct explanation for statement
(B) statement 1 and statement 2 are correct and statement 2 is not correct explanation of for statement 1
(C) statement 1 is true and statement 2 is false
(D) statement 1 s wrong and statement 2 is true

Answer 1

Hint: In this question, we will use the concept of the coefficient of the linear expansion for the invar steel. First, we will discuss the composition of Invar. Then compare its properties to use these to solve the question.

Complete step by step answer:
As we know that Invar is a nickel-iron alloy mainly Invar is famous for its low coefficient of thermal expansion (CTE). The name Invar refers itself to its relative lack of contraction or expansion with temperature. The main centre of attraction for Invar is that- In temperature between they maintain constant dimensions. The biggest feature is that they have a coefficient of thermal expansion nearly equal to zero. So we can say that the temperature differences do not affect the material. Also, they don’t have (or have 0) linear expansion. Therefore the time becomes accurate at every point of temperature. They are used in clock pendulums. Therefore throughout the seasons the clock shows correct time. The length of the pendulum will not change according to the change in external atmosphere.

So, option (C) is correct that is statement 1 (Invar steel is used to prepare clock pendulum) is true and statement 2 (The coefficient of linear expansion of invar steel is Infinity) is false.

Note: As we know that Invar is used in the various fields. It includes optical engineering and also in measuring and positioning devices. Invar has its wide scale application. Invar is used where high dimensional stability is required (for example televisions, seismic creep gauges, instruments, clocks etc.