SSC JE 2023-BMC (Building Materials & Construction): Expected Questions

Do you know all about Rocks? Today, we’ll delve into the world of SSC JE 2023-BMC (Building Materials & Construction) and explore the expected questions that can truly set you up for success. Aspiring engineers and construction enthusiasts, brace yourselves for an insightful journey as we unravel key concepts and anticipated questions in this crucial subject area. Whether you’re gearing up for the SSC JE exam or simply looking to enhance your knowledge, our aim is to provide you with valuable insights and resources to sharpen your understanding. And what’s more, we have an exciting offer in store for you – a chance to take a free SSC JE 2023 mock test that will not only prepare you for the real SSC JE exam but also give you a taste of what’s to come. So, without further ado, let’s dive in and explore the fascinating world of Building Materials & Construction!

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Also read: SSC JE 2023 Exam-Power Plant: Babcock-Wilcox Water Tube Boiler

SSC JE 2023-BMC (Building Materials & Construction): Expected Questions

1.         Out of the following, which may be termed as an unstratified Rock?

            (a) Sandstone

            (b) Limestone

            (c) Marble

            (d) Slate

Sol: C

Classification of Rock

Types of rock	Example
Igneous Rocks	Granite, Rhyolite, Syenite, Andesite, Gabbro
Sedimentary Rocks	Gypsum, magnesite, Sandstone, Limestone, diatomite, Chalk
Metamorphic Rocks	Gneiss, Marble, Slate and Schist

Types of rock	Example
Stratified Rocks	Sandstone, Limestone, Shale, Slate
Unstratified Rocks	Basalt, Granite, Marble
Foliated Rocks	Gneiss

Types of rock	Example
Argillaceous Rocks	Slate
Silicious Rocks	Gneiss
Calcareous Rocks	Marble

2.         Moh’s scale is used for stones to determine:

(a) Flakiness index

(b) Durability

(c) Strength

(d) Hardness

Ans. (d)

Moh’s hardness, rough measure of the resistance of a smooth surface to scratching or abrasion, expressed in terms of a scale by the German mineralogist Friedrich Moh’s.

Moh’s Hardness Scale
Mineral	Moh’s Hardness
Talc	1
Gypsum	2
Calcite	3
Fluorite	4
Apatite	5
Orthoclase	6
Quartz	7
Topaz	8
Corundum	9
Diamond	10

3.         An explosive that contains: 65% saltpetre, 20% sulphur and 15% charcoal is
(a) Dynamite
(b) Nitrocellulose
(c) Blasting powder
(d) Cordite
Sol-(c)

• Blasting powder composition consists of: 65% saltpetre, 20% sulphur, and 15% charcoal.
• Dynamite comprises: 75% nitroglycerine, which is soaked into 25% sandy earth to create a dense paste.
• Cordite: A potent, smokeless explosive employing Nitroglycerine.
• Nitrocellulose or Gun cotton: Produced by impregnating cotton with nitric acid.

4.         A stone is rejected if it absorbs water more than
(a) 5%
(b) 10%
(c) 20%
(d) 25%
Sol-(b)
A good stone should be having less porosity and so it should have water absorption between 5-10% and should be rejected if water absorption is more than 10%.

5.         Hardness of the rock can be tested in situ using
(a) Smith’s test
(b) Schmidth Hammer test
(c) Acid test
(d) Crystallization test
Sol-(b)

• Schmidth hammer rebound test was developed to determine the compressive strength of concrete and has been used to determine the hardness and compressive strength of rock material.
• This instrument is portable, easy to use, and can be applied both in the laboratory and in the field.

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Takeaway

In the realm of Building Materials & Construction, knowledge is the cornerstone of success. As we’ve discovered through this blog, understanding the distinctions between different rock types, their properties, and applications is crucial for any aspiring engineer. From identifying unstratified rocks to evaluating stone hardness, and from Moh’s scale to explosive compositions – every piece of information contributes to a well-rounded comprehension of the subject. The Schmidth Hammer rebound test stands out as an indispensable tool for assessing rock hardness, applicable both in controlled environments and real-world field situations. Armed with this knowledge, you’re better equipped to face SSC JE 2023-BMC questions with confidence. And as a bonus, our free SSC JE 2023 mock test awaits, providing you with a practical opportunity to put your knowledge to the test and fine-tune your preparation. Remember, success is built on a foundation of understanding, and by engaging with these resources, you’re taking a significant step toward achieving your goals in the world of engineering and construction.