Staff Selection Commission Combined Higher Secondary Level Exam
Question : If $\sin m+\sin n=p, \cos m+\cos n=q$, then find the value of $\sin m \times \sin n+\cos m \times \cos n$.
Option 1: $p^2+q^2-2$
Option 2: $\frac{p^2+q^2-2}{2}$
Option 3: $p+q-p q$
Option 4: $p+q+p q$
Correct Answer: $\frac{p^2+q^2-2}{2}$
Solution : Given, $\sin m+\sin n=p$ and $ \cos m+\cos n=q$ Consider, $\sin m + \sin n = p$ Squaring both sides, ⇒ $(\sin m + \sin n)^2 = p^2$ ⇒ $\sin^2m+\sin^2n+2\sin m\sin n=p^2$ We know, $\sin^2x+\cos^2x=1$ ⇒ $1 - \cos^2 m + 1 - \cos^2 n
Question : If $\triangle ABC$~$\triangle PQR$, the ratio of perimeter of $\triangle ABC$ to perimeter of $\triangle PQR$ is 36 : 23 and QR = 3.8 cm, then the length of BC is:
Option 1: $4 \frac{103}{121} cm$
Option 2: $3 \frac{109}{121} cm$
Option 3: $5 \frac{109}{115} cm$
Option 4: $3 \frac{107}{115} cm$
Correct Answer: $5 \frac{109}{115} cm$
Solution : $\triangle ABC$~$\triangle PQR$ $\frac{BC}{QR}$ = $\frac{Perimeter(\triangle ABC)}{Perimeter(\triangle PQR)}$ $\frac{BC}{3.8}$ = $\frac{36}{23}$ BC = $\frac{36×38}{230}$ = $ \frac{684}{115}$ = $5 \frac{109}{115}$ cm Hence, the correct answer is $5 \frac{109}{115}$ cm.
Question : Name the river which is a reason for the dispute between India and Bangladesh?
Option 1: Teesta
Option 2: Brahmaputra
Option 3: Ganga
Option 4: None of the above
Correct Answer: Teesta
Solution : The correct option is Teesta.
The Teesta River water-sharing dispute has been a point of contention between Bangladesh and India. The Teesta River is a significant River for both India and Bangladesh. It drains 2800 sq. km of Bangladesh and almost fills the floodplains
Question : Which type of emergency has been imposed only one time in India so far?
Option 1: Internal Emergency
Option 2: State Emergency
Option 3: External Emergency
Option 4: Financial Emergency
Correct Answer: Internal Emergency
Solution : The correct option is Internal Emergency.
The "Internal Emergency" or "State of Emergency," which was announced in 1975, was the only type of national emergency to be enforced in India just once. It was declared by the prime minister at the time, Indira Gandhi,
Question : A seller allows a discount of 9% on a watch. If he allows a discount of 6%, he earns Rs. 30 more in profit. What is the marked price?
Option 1: Rs. 900
Option 2: Rs. 1,400
Option 3: Rs. 1,000
Option 4: Rs. 1,300
Correct Answer: Rs. 1,000
Solution : Given: Discount of 9% on a watch. A discount of 6% yields Rs. 30 more profit. We know, Marked price = $\frac{\text{Selling price}}{(1 - \frac{\text{Discount %}}{100})}$ Let marked price = $x$ ⇒ Difference in selling price with 9% and 6% discount = Rs. 30
Question : Select the most appropriate homonym to fill in the blank.
Should we go shopping for a_________ fan for our new house?
Option 1: ceiling
Option 2: sealink
Option 3: sealing
Option 4: selling
Correct Answer: ceiling
Solution : The first option is the correct answer.
A ceiling fan is a common household item designed to circulate air in a room and is installed on the upper interior surface of a room.
The meanings of the other options are as follows:
Question : Comprehension:
In the following passage, some words have been deleted. Read the passage carefully and select the most appropriate option to fill in each blank.
Unemployment arises from a variety of_____ (1). One which is always recurring and the effects of which we have had a recent example is the disorganisation of the industry resulting from a long war, this is a serious______ (2) admitting of no easy ________(3) at the best of times. Again there is unemployment which followed a marked diminution in the______ (4) of any raw product, such as cotton; fewer hands are required in the mills and the factories. We may call this the cause of bad harvests. Similar, but more serious is the effect of changes in industry due to the invention of machinery which does more work and requires________ (5) hands. Yet another cause is strike or lockout and this is more to be deplored because such a stoppage is due to a very trivial matter, perhaps the men are working half an hour longer than what their Union permits.
Select the most appropriate option to fill in the blank number 1.
Option 1: causes
Option 2: thoughts
Option 3: things
Option 4: types
Correct Answer: causes
Solution : The correct choice is the first option.
In the context of the passage, the word causes logically fits in the blank. The sentence discusses various reasons or factors leading to unemployment, and causes is the appropriate term to express this idea. The sentence structure requires
Question : Directions: Select the option in which the numbers share the same relationship in the set as that shared by the numbers in the given set.(NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into their constituent digits.E.g.13 – operations on 13 such as adding/subtracting/multiplying, etc. to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed.) (14, 28, 2) (3, 42, 14)
Option 1: (5, 35, 8)
Option 2: (17, 68, 4)
Option 3: (9, 99, 10)
Option 4: (16, 36, 3)
Correct Answer: (17, 68, 4)
Solution : Given: (14, 28, 2); (3, 42, 14)
Multiply the first and the third numbers to get the second number of the triad. (14, 28, 2)→14 × 2 = 28 (3, 42, 14)→3 × 14 = 42
Let's check each option – First option:
Question : Two jars A and B contain the solutions of two liquids P and Q. The ratio of the liquids P and Q in jars A and B are 2 : 19 and 1:11, respectively. If 7 litres of the solution of jar A and 4 litres of the solution of jar B are mixed, what is the ratio of the solutions P and Q in the new mixture?
Option 1: 10 : 1
Option 2: 1 : 9
Option 3: 9 : 1
Option 4: 1 : 10
Correct Answer: 1 : 10
Solution :
⇒ $P:Q=(\frac{2}{21}\times7+\frac{1}{12}\times4):(\frac{19}{21}\times7+\frac{11}{12}\times4)$ ⇒ $P:Q=(\frac{2}{3}+\frac{1}{3}):(\frac{19}{3}+\frac{11}{3})$ ⇒ $P:Q=\frac{2+1}{3}:\frac{19+11}{3}$ $\therefore P: Q=3:30=1:10$ Hence, the correct answer is 1 : 10.
Question : Directions: Read the given statements and conclusions carefully. You have to take the given statements to be true even if they seem to be at variance from commonly known facts. You have to decide which conclusions logically follow/s from the given statements. Statements: Some tables are caps. All caps are bikes. All bikes are pins. Conclusion (I): Some pins are tables. Conclusion (II): Some caps are not pins.
Option 1: Only conclusion (II) is true
Option 2: Only conclusion (I) is true
Option 3: Neither conclusion (I) nor (II) is true
Option 4: Both conclusions (I) and (II) are true
Correct Answer: Only conclusion (I) is true
Solution : The possible Venn diagram, according to the given statements is as follows –
Let's analyse the conclusions – Conclusion (I): Some pins are tables – According to the Venn diagram, the circle of pins and tables intersect and have some common
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