Staff Selection Commission Combined Graduate Level Exam
Question : A delivery boy started from his office at 10 am to deliver an article. He rode his scooter at a speed of 32 km/h. He delivered the article and waited for 15 minutes to get the payment. After the payment was made, he reached his office at 11:25 am, travelling at a speed of 24 km/h. Find the total distance travelled by the boy.
Option 1: 35 km
Option 2: 40 km
Option 3: 32 km
Option 4: 30 km
Correct Answer: 32 km
Solution : Given: A delivery boy started from his office at 10 am to deliver an article. He rode his scooter at a speed of 32 km/h. He delivered the article and waited for 15 minutes = $\frac{15}{60}=\frac{1}{4}$ h to get the payment. After the payment
Question : Comprehension:
Read the following passage and answer the questions given after it.
Wetlands are amongst the most productive ecosystems on the Earth and provide many important services to human society. They exhibit enormous diversity according to their genesis, geographical location, water regime and chemistry, dominant species, and soil and sediment characteristics. Globally, the area extent of wetland ecosystems ranges from 917 million hectares (m ha) to more than 1275 m ha. One of the first widely used wetland classification systems, devised by Cowardin et al., 1979, categorised wetlands into marine (coastal wetlands), estuarine (including deltas, tidal marshes, and mangrove swamps), lacustrine (lakes), riverine (along rivers and streams), and palustrine ( marshes, swamps and bogs) based on their hydrological, ecological and geological characteristics.The
The Ramsar Convention on Wetlands was an international treaty signed in 1971. Overall, 1052 sites in Europe; 289 sites in Asia; 359 sites in Africa; 175 sites in South America; 211 sites in North America; and 79 sites in the Oceania region have been identified as Ramsar sites or wetlands of International importance. As per the Ramsar Convention definition most of the natural water bodies (such as rivers, lakes, coastal lagoons, mangroves, peat land, coral reefs) and man-made wetlands (such as ponds, farm ponds, irrigated fields, sacred groves, salt pans, reservoirs, gravel pits, sewage farms and canals) in India constitute the wetland ecosystem distributed in different geographical regions ranging from Himalayas to Deccan plateau. As of February 2022, India has 49 Ramsar sites covering an area of 10,93,636 hectares, the highest in South Asia. As per the estimates, India has about 757.06 thousand wetlands with a total wetland area of 15.3 m ha, accounting for nearly 4.7% of the total geographical area of the country. Out of this, areas under inland wetlands account for 69%, coastal wetlands 27%, and other wetlands (smaller than 2.25 ha) 4%. Gujarat has the highest proportion (17.5%) and Mizoram has the lowest proportion (0.66%) of the area under wetlands. Among Union Territories, Lakshadweep has the highest proportion (around 96%) and Chandigarh has the lowest proportion (3%) of the geographical area under wetlands.
Question:
In India, what kind of wetlands occupy the largest area?
Option 1: coastal wetlands
Option 2: mangrove swamps
Option 3: inland wetlands
Option 4: small wetlands
Correct Answer: inland wetlands
Solution : The correct choice is the first option.
Explanation: In India, inland wetlands occupy the largest area. The passage mentions that as of February 2022, India has about 757.06 thousand wetlands with a total wetland area of 15.3 million hectares. Out of this
Question : For which of the games the players must know Pascal's law?
Option 1: Climbing
Option 2: Paragliding
Option 3: Rafting
Option 4: Scuba diving
Correct Answer: Scuba diving
Solution : The correct answer is scuba diving.
Scuba diving players must know Pascal's law to understand the change of pressure under water. Pressure changes at a rate of 100 kPa with every 10 m increase in the depth of the water.
Question : The volume of a right circular cone is 308 cm3 and the radius of its base is 7 cm. What is the curved surface area (in cm2) of the cone? (Take $\pi=\frac{22}{7}$)
Option 1: $22 \sqrt{21}$
Option 2: $44 \sqrt{21}$
Option 3: $22 \sqrt{85}$
Option 4: $11 \sqrt{85}$
Correct Answer: $22 \sqrt{85}$
Solution : The volume $V$ of a right circular cone is $V = \frac{1}{3}\pi r^2 h$, where $r$ is the radius of the base and $h$ is the height of the cone. Given that $V = 308 \, \text{cm}^3$ and $r = 7 \, \text{cm}$, $⇒308
Question : If in $\triangle$ABC, DE || BC, AB = 7.5 cm, BD = 6 cm, and DE = 2 cm then the length of BC in cm is:
Option 1: 6
Option 2: 8
Option 3: 10
Option 4: 10.5
Correct Answer: 10
Solution : Given: In $\triangle$ABC, DE || BC, AB =7.5 cm, BD = 6 cm, and DE = 2 cm So, AD = 7.5 – 6 = 1.5 cm In ∆ ADE and ∆ ABC, ∵ DE | | BC ∵ $\angle$ADE = $\angle$B ; $\angle$AED =
Question : One of the angles of a right-angled triangle is 15º, and the hypotenuse is 1 metre. The area of the triangle (in square cm) is:
Option 1: 1220
Option 2: 1200
Option 3: 1250
Option 4: 1215
Correct Answer: 1250
Solution :
The area of a right-angled triangle, $\text{Area} = \frac{1}{2} \times\mathrm{base} \times\mathrm{height}$ Given that one of the angles is 15º. $\mathrm{AB=AC \sin15^\circ}$ $\mathrm{BC=AC \cos15^\circ}$ ⇒ $\text{Area} = \mathrm{\frac{1}{2} \times AC \sin15^\circ \times AC \cos15^\circ}$ ⇒ $\text{Area} =\mathrm{ \frac{1}{4} \times AC^2 \times2 \times \sin( 15^\circ)\times \cos( 15^\circ)}$
Question : If the diagonals of a rhombus are 8 cm and 6 cm, then the square of its side is:
Option 1: $25\;\mathrm{cm^2}$
Option 2: $55\;\mathrm{cm^2}$
Option 3: $64\;\mathrm{cm^2}$
Option 4: $36\;\mathrm{cm^2}$
Correct Answer: $25\;\mathrm{cm^2}$
Solution : The square of the side length, $s^2= \frac{d_1^2 + d_2^2}{4}$, where $d_1$ and $d_2$ are the diagonals of a rhombus. ⇒ The square of the side length of the rhombus $=\frac{8^2 + 6^2}{4} = \frac{64 + 36}{4} =25\;\mathrm{cm^2}$ Hence, the correct answer is $25\;\mathrm{cm^2}$.
Question : Which element of Group 13 is a soft metal with a low melting point (303 K) and is widely used in doping semiconductors and producing solid-state devices such as transistors?
Option 1: Aluminium
Option 2: Boron
Option 3: Thallium
Option 4: Gallium
Correct Answer: Gallium
Solution : The correct answer is Gallium.
The element from Group 13 with a low melting point of 303 K (30°C) that is widely used in doping semiconductors and producing solid-state devices such as transistors is indeed gallium.
Question : Who among the following was defeated in the battle of Chanderi in 1528?
Option 1: Shershah Suri
Option 2: Babur
Option 3: Sikandar Lodi
Option 4: Medini Rai
Correct Answer: Medini Rai
Solution : The correct answer is Medini Rai.
In the Battle of Chanderi in 1528, the defeated ruler was Medini Rai. This historical conflict is often associated with Babur, the founder of the Mughal Empire in India, who led the victorious forces against Medini Rai.
Question : What accumulates in the muscles after continuous strenuous physical exercise as a result of temporary anaerobic respiration that causes muscular fatigue ?
Option 1: ATP
Option 2: Lactic acid
Option 3: Ethyl alcohol
Option 4: Carbon dioxide
Correct Answer: Lactic acid
Solution : The correct answer is Lactic Acid.
Lactic acid builds up in the muscles of the human body as a result of strenuous exercise or muscular exhaustion. It is generated in the human body by the anaerobic respiration of carbohydrates. It is a byproduct of
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