Staff Selection Commission Combined Graduate Level Exam
Question : Simplify the following. $\frac{\sin^3 \alpha+\cos^3 \alpha}{\sin \alpha+\cos \alpha}$
Option 1: $1+\sin \alpha \cos \alpha$
Option 2: $\tan \alpha$
Option 3: $1-\sin \alpha \cos \alpha$
Option 4: $\sec \alpha$
Correct Answer: $1-\sin \alpha \cos \alpha$
Solution : $\frac{\sin^3 \alpha+\cos^3 \alpha}{\sin \alpha+\cos \alpha}$ = $\frac{(\sin \alpha+\cos \alpha)(\sin^2 \alpha+\cos^2 \alpha–\sin \alpha\cos \alpha)}{\sin \alpha+\cos \alpha}$ = $(1–\sin \alpha\cos \alpha)$ [$\because \sin^2 \alpha+\cos^2 \alpha=1]$ Hence, the correct answer is $(1–\sin \alpha\cos \alpha)$.
Question : $\cos^3 60°-\cos^3 240°-\cos^3 360°=$ _________.
Option 1: $-\frac{3}{4}$
Option 2: $-\frac{7}{5}$
Option 3: $-\frac{3}{5}$
Option 4: $-\frac{9}{7}$
Correct Answer: $-\frac{3}{4}$
Solution : Given: $\cos ^3 60°-\cos ^3 240°-\cos ^3 360°$ Now, $\cos60°=\frac{1}{2}$ $\cos240°=\cos(180°+60°)=-\cos60°=-\frac{1}{2}$ $\cos360°=\cos(360°+0°)=\cos0°=1$ So, $\cos^3 60°-\cos^3 240°-\cos^3 360°$ = $(\frac{1}{2})^3-(-\frac{1}{2})^3-(1)^3$ = $\frac{1}{8}+\frac{1}{8}-1$ = $-\frac{3}{4}$ Hence, the correct answer is $-\frac{3}{4}$.
Question : There is a ratio of 5 : 4 between the two numbers. If 40 percent of the first number is 12, then 50% of the second number is:
Option 1: 12
Option 2: 24
Option 3: 18
Option 4: 20
Correct Answer: 12
Solution : Given: The ratio of two numbers = 5 : 4 Let the numbers be $5x$ and $4x$. 40% of the first number = 12 So, $\frac{40}{100}\times 5x=12$ $⇒x=6$ $\therefore$ The first number = 5 × 6 = 30 and the second number = 4 ×
Question : Which of the following is the smallest bird?
Option 1: Piegon
Option 2: Parrot
Option 3: Humming bird
Option 4: House sparrow
Correct Answer: Humming bird
Solution : The correct answer is Humming bird.
The bee hummingbird is the world's tiniest bird. Native of Cuba, the bird measures around 2 inches long and weighs approximately 0.07 ounces. It is so little that it is sometimes misidentified as an insect. Bee hummingbirds are
Question : Select the most appropriate indirect form of the given sentence. "Remove all the stains carefully and clean the windows," said the contractor to the worker.
Option 1: The contractor said to the worker that you should remove all the stains carefully and clean the windows.
Option 2: The contractor requested the worker to remove all the stains carefully and clean the windows.
Option 3: The contractor told the worker that by removing all the stains carefully, the windows will be cleaned.
Option 4: The contractor instructed the worker to remove all the stains carefully and clean the windows.
Correct Answer: The contractor instructed the worker to remove all the stains carefully and clean the windows.
Solution : The fourth option is correct.
The given sentence is in the direct speech. As it is a case of instruction, instructed is used in the indirect speech to report.
Narration
Question : Directions: Select the figure from among the given options that can replace the question mark (?) in the following series.
Option 1:
Option 2:
Option 3:
Option 4:
Correct Answer:
Solution : According to the given figure series – I. The chain of the symbol inside the box is moving forward in the increasing order of the places for example, in the first step, it is shifting one place forward then in the second step, two places forward,
Question : Pancha siddhantham of Varaha mihira deals with
Option 1: Astrology
Option 2: Astronomy
Option 3: Medicine
Option 4: Anatomy
Correct Answer: Astronomy
Solution : The correct option is Astronomy.
Varahamihira wrote the Pancha Siddhantika, a book on mathematical astronomy, in the sixth century CE. It is a synthesis of five older astronomical systems: the Surya Siddhanta, the Romaka Siddhanta, the Paulisa Siddhanta, the Vasishtha Siddhanta, and the Paitamaha Siddhanta.
Question : In the given sentence the underlined word may have been incorrectly spelt. Identify the option that rectifies the spelling. If there is no error in spelling, select ‘No Error’. The ameteur sculptor received an award at the international sculpting competition.
Option 1: ameature
Option 2: No Error
Option 3: amateur
Option 4: ameateur
Correct Answer: amateur
Solution : The correct choice is the third option.
The correct spelling is amateur. The word amateur refers to someone who engages in a particular activity, such as sculpting, for the love of it or as a hobby, rather than as a professional.
Therefore, the correct
Question : If the government revenue expenditure exceeds revenue receipt, it is called:
Option 1: revenue deficit
Option 2: primary deficit
Option 3: capital deficit
Option 4: fiscal deficit
Correct Answer: revenue deficit
Solution : The correct option is a revenue deficit.
The term "deficit budget" refers to a situation in which the government spends more money than it brings in for government initiatives. The excess of expenses over receipts on a revenue account is called a revenue
Question : In an equilateral triangle of side 24 cm, a circle is inscribed touching its sides. The area of the remaining portion of the triangle is:
Option 1: $98.55\;\mathrm{cm^2}$
Option 2: $100 \;\mathrm{cm^2}$
Option 3: $101 \;\mathrm{cm^2}$
Option 4: $95\;\mathrm{cm^2}$
Correct Answer: $98.55\;\mathrm{cm^2}$
Solution :
In an equilateral triangle, the radius of the inscribed circle, where $a$ is the side of the equilateral triangle. $r = \frac{a\sqrt{3}}{6}$ Put $a=24\text{ cm}$, $r = \frac{24\sqrt{3}}{6} = 4\sqrt{3} \text{ cm}$ The area of the inscribed circle, where $r$ is the radius of the
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