Explore topic-wise InterviewSolutions in Current Affairs.

This section includes 7 InterviewSolutions, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.

1.

Explain how the government can use the budgetary policy in reducing inequalities of income? 

Answer»

Government can reduce inequalities through its tax and expenditure policy. Government can charge higher rate of tax from higher income groups by imposing higher rate of income tax and higher rate on goods and services purchased by the rich. The money so collected can be spent on the poor in the form of free education,free medical facilities,cheaper housing,etc. in order to raise their disposable income.

2.

When was the Associated Chambers of Commerce and Industry of Uttar Pradesh founded?1. 19912. 19943. 19994. 2001

Answer» Correct Answer - Option 2 : 1994

The correct answer is 1994.

  • The associated chambers of commerce and industry of Uttar Pradesh founded in 1994.
  • The Associated Chambers of Commerce and Industry of India ( ASSOCHAM ) is a non-governmental trade association and advocacy group.
  • The organization represents the interests of trade and commerce in Uttar Pradesh and acts as an interface between issues and initiatives.
  • The goal of this organization is to reduce trade barriers while fostering a conducive environment for the growth of trade and industry in Uttar Pradesh.

About Uttar Pradesh:

  • Chief Minister - Yogi Adityanath.
  • Governor - Anandiben Patel.
  • Deputy Chief Minister - Keshav Prasad Maurya.
  • Capital - Lucknow.
  • Speaker of Legislative Assembly - Hriday Narayan Dikshit.
  • State Bird - Sarus Crane.
  • Total districts - 75.
3.

Indira Sagar dam was commissioned in the year_________. 1. 19852. 19473. 19984. 2005

Answer» Correct Answer - Option 4 : 2005

The correct answer is 2005.

 

  • Indira Sagar Dam is a multipurpose dam project at Madhya Pradesh.
  • It was built on the Narmada river which flows from Central India to Western India.
  • The project foundation stone was laid in the year 1984 by the Prime Minister of India but main-dam construction started in the year 1992.
  • It was completed in the year 2003 and was commissioned in the year 2005.

 

Narmada river

  • Narmada river forms the traditional boundary between North India and South India.
  • Narmada river originates near the Amarkantak hill in the Anuppur District of eastern Madhya Pradesh.
  • The basin covers large areas in the states of Madhya Pradesh (86%), Gujarat (14%), and a comparatively smaller area (2%) in Maharashtra.
  • The Bhimbetka caves are located in a dyke of the Narmada valley at about 45 km northeast of Bhopal.
4.

Where is the Jait Sagar Lake located?1. Mount Abu2. Udaipur3. Bundi4. Ajmer

Answer» Correct Answer - Option 3 : Bundi

The correct answer is Bundi.

  • Jait Sagar Lake located in Bundi.

  • Famous tourist attraction in Bundi, Jait Sagar Lake is situated amidst lush green lands.
  • This 1.5 km long lake can act as a rejuvenating experience for all the travellers on their tour to Bundi.
  • On the bank of the river, one can see the huge carvings of elephants. 
5.

Shankariya dance of Rajasthan is related to1. Kalbeliya2. Bhil3. Sahariya4. Terahtali

Answer» Correct Answer - Option 1 : Kalbeliya

The correct answer is Kalbeliya.

  • The Kalbeliya is the snake-charmer community from Rajasthan.
  • Shankariya dance is a folk dance associated with the folk culture of Rajasthan.
  • Shankariya dance is an integral part of their Kalbeliya culture and is performed by men and women.

  • Bhil tribe is the largest tribal group in India. Bhils are listed as indigenous people of the states of Gujarat, Madhya Pradesh, Chhattisgarh, Maharashtra, and Rajasthan.
  • The most famous art form of the Bhil tribe is the “Gowari” which is a kind of dance drama.
  • Sahariya tribe is found in the state of Madhya Pradesh.
  • Other folk dances of Rajasthan:
    • Ghoomar Dance
    • Terahtali Dance
    • Drum Dance
    • Chari Dance
    • Kathputli Dance
6.

Who was the first woman to win the Jnanpith Award?1. Prathibha Ray2. Ashapoorna Devi3. Mahasweta Devi4. Indira Goswami

Answer» Correct Answer - Option 2 : Ashapoorna Devi

The correct answer is Ashapoorna Devi.

  • Jnanpith Award is an Indian literary award presented annually by the Bharatiya Jnanpith to an author for their "outstanding contribution towards literature".
  • Instituted in 1961, the award is bestowed only on Indian writers writing in Indian languages included in the Eighth Schedule of the Constitution of India.
  • The prize carries a cash award of Rs. 11 lakhs, a citation, and a bronze replica of Vagdevi (Saraswati), the goddess of learning.
  • The first recipient of the award was the Malayalam writer G. Sankara Kurup who received the award in 1965 for his collection of poems, Odakkuzhal (The Bamboo Flute), published in 1950.
  • Ashapoorna Devi was the first woman to win the Jnanpith award in the year 1976. The award was given for her literary work in the Bengali language.
  • Eminent Malayalam poet Akkitham Achuthan Namboothiri, popularly known as Akkitham, has been chosen for the 55th Jnanpith Award, according to an announcement by the Jnanpith Selection Board for the year 2020.
7.

Which of the following companies was chosen for the UN Global Climate Action Award in the ‘Carbon Neutral Now’ category in September 2019?1. Reliance Health2. Infosys3. Wipro4. Organic India

Answer» Correct Answer - Option 2 : Infosys

The correct answer is Infosys.

  • The company got this award for being the only Indian corporate to earn recognition for its effort to combat climate change.
  • UN Climate Summit in New York was convened by UN Secretary-General Antonio Guterres.
  • The award will be presented to Infosys at the UN Climate Change Conference (COP25) at Santiago in Chile.

  • Infosys in a multinational corporation that provides -
  1. Business consulting
  2. Information technology
  3. outsourcing services
  • The company was founded on 7th July 1981 in Pune.
  • The headquarter of the company is in Banglore.
  • The current CEO of this company is Salil Parekh.

  • The UN Global Climate Action Awards are organized by the Momentum for Change initiative of the UN Climate Change Secretariat. 
  • The award-winning projects are recognized for their innovative solutions that address climate change, and help drive progress on many other sustainable development goals like poverty alleviation, gender equality and economic opportunity.
  • The UN Global Climate Action Award of 2020 was recognized in three categories -
  1. Climate Neutral Now
  2. Women for results
  3. Financing for climate-friendly Investment.
8.

If for the parallel reactions A→B and A→C, if the final concentration of B is 26 mol/ L and A converted is 36 mol/L, then the final concentration of C is ____(a) 15(b) 5(c) 6(d) 10

Answer» Right option is (d) 10

Easiest explanation: CA0 – CA = 36

CB = 26

CC = A converted – B formed

CC = 10 mol/L.
9.

Space time is defined as ____(a) Time required to process unit volume of feed(b) Time required for the reaction to occur(c) Time required to produce unit volume of product(d) Time to process the entire volume of feed entering

Answer» Right option is (a) Time required to process unit volume of feed

To elaborate: Space time is the time spent by a unit volume of reactants inside the reactor. It is the performance measure for a flow reactor.
10.

The Alexander Dalrymple Award is given by the Hydrographic Office of___1. France2. The US3. The UK4. Norway

Answer» Correct Answer - Option 3 : The UK

The correct answer is The UK.

  • Alexander Dalrymple Award is presented by the UK Ministry of Defence.
    • Recipients of the award are selected by the chief Committee of the UK Hydrographic Office(UKHO).
    • It is given for efforts in raising the standards of hydrography, cartography, and navigation around the world

  • Vice Admiral Vinay Badhwar has been awarded the Alexander Dalrymple Award 2019.
  • He is India’s Chief Hydrographer.
  • Chief of the Naval Staff:- Admiral Karambir Singh (as of March 25, 2021)
  • Hydrography is the science that measures and describes the physical features of the navigable portion of the Earth's surface and adjoining coastal areas. 
  • Alexander Dalrymple (1737-1808) was a Scottish geographer and first hydrographer of the British Admiralty.
As of March 25, 2021

Country 

Capital

President

Prime Minister

Norway

Oslo

Harald V (King)

Erna Solberg

France

Paris

Emmanuel Macron

Jean Castex 

England

London

Queen Elizabeth II (Monarch) 

Boris Johnson

US

Washington D.C

Joe Biden

NA

 

  • The United Kingdom is not a country.
  • England is the country.
  • Britain is an area that consists of England and Wales.
  • Great Britain is the name of the island that is home to the countries of England, Wales, and Scotland.
  • The United Kingdom (UK) is a union of the countries on the island of Great Britain, along with the country of Northern Ireland.
  • The Republic of Ireland is a different country whose capital is Dublin.
  • London is also the capital of the UK.
11.

With regard to the Biological Nitrogen Fixation by Rhizobium in association with soybean, which one of the following statement/statements does not hold true. (a) Nitrogenase may require oxygen for its functioning(b) Nitrogenase is MO- Fe protein (c) Leg-hemoglobin is a pink coloured pigment. (d) Nitrogenase helps to convert N2 gas into two molecules of ammonia.

Answer»

(a) Nitrogenase may require oxygen for its functioning

12.

The battery case is made of___. a. Poly-propylene b. Hard-rubber c. Plastic base materials d. Any of the above materials

Answer»

Correct option: d. Any of the above materials

13.

What Vegetable?Broad, runner, navy, soy, and lima are all varieties of___

Answer»

Correct answer is Beans

14.

Heavy use of soy products as a substitute for meat can inhibit absorption ofa. calciumb. folatec. vitamin Dd. iron

Answer»

Heavy use of soy products as a substitute for meat can inhibit absorption of iron.

15.

I do not ________ to be clever but I am not stupid. A) permit B) classify C) confess D) claim E) compare

Answer»

Correct option is D) claim

16.

The child was told to ________ for being rude to his uncle. A) excuse B) apologize C) punish D) confess E) pardon

Answer»

Correct option is B) apologize

17.

UTI in patients with long term indwelling catheters

Answer»

UTI in residents with chronic indwelling catheters is the most common source of bacteremia in long-term care facility residents. These residents have been reported to have up to 39 times more episodes of bacteremia from a presumed urinary source compared with residents without an indwelling catheter.

18.

SEBI is empowered by the Finance Ministry nominate ……………. mumbers on the governing body of every stock exchange. (a) 5 (b) 3 (c) 6 (d) 7

Answer»

SEBI is empowered by the Finance Ministry nominate mumbers on the governing body of every stock exchange.

19.

Risk in the Money Market is …………… (a) High (b) Market Risk (c) Low credit and Market Risk (d) Medium Risk

Answer»

Risk in the Money Market is Low credit and Market Risk.

20.

A pessimistic speculator is …………(a) Stag (b) Bear (c) Bull (d) Lame Duck

Answer»

A pessimistic speculator is Bear.

21.

An optimistic speculator is …………… (a) Bull(b) Bear (c) stag (d) Lame Duck

Answer»

An optimistic speculator is Bull.

22.

If the insurance premium paid Rs. 1,000 and prepaid insurance of Rs. 400. The amount of insurance premium shown in profit and loss a/c will be:(a) Rs. 1400(b) Rs. 1000(c) Rs. 400(d) Rs. 600

Answer»

Correct answer (d) Rs. 600

23.

Profit and Loss Account is an account prepared to find out ………

Answer»

Profit and Loss Account is an account prepared to find out Net Profit or Net Loss.

24.

When the Manager is entitled to a commission of 10% on profits after charging such commission, it is calculated on profits before charging commission by the formula ………….(a) 10/90(b) 10/100(c) 10/110(d) 90/100

Answer»

Correct answer is (c) 10/110

25.

What is SANKALP?

Answer»

It is an initiative of Department of Pension and Pensioners’ Welfare, Government of India which provides a platform for the pensioners to access opportunities available for useful interventions in society. It also facilitates the organizations working in these areas to select appropriate skill and expertise from the available pool of volunteer pensioners. Another key element of the initiative is to conduct Pre-retirement Counselling Workshops to help the retiring employees to transit smoothly into their 2nd innings. 

26.

Under the British system of land settlement, the zamindar's dues to the state were fixed. What did this mean for the cultivators? A. They received investment support to increase production. B. They were exploited and forced to pay rent regardless of the produce. C. They had the support of the landlords against the oppressive policies of the British. D. They were forced to shift from food crops to commercial crops, leading to food scarcity.

Answer»

B. They were exploited and forced to pay rent regardless of the produce. 

27.

Whether Pensioners’ Identity Card can be issued to retired employees covered under NPS. 

Answer»

The concerned Ministries / Departments may issue Pensioners’ Identity Card (PIC) to retired NPS employees in the format prescribed under OM No 41/21/2000-P&PW(D) dated 25.7.2013,12.08.2015 and 20.08.2015.

28.

What are the guidelines/orders in regard to settlement of dues of the deceased Government employees covered under NPS? 

Answer»

As per the Department of pension & PW O.M. No. 38/41/06-P&PW(A) dated 5.5.2009 (available on website) the benefits under the CCS(Pension ) Rules has been provisionally extended to the families of deceased employees covered under NPS. Family Pension/gratuity in terms of O.M. dated 5.5.2009 shall be payable to the family of the deceased employee if the deceased employee was covered under NPS and fulfils the conditions. These payments are provisional and will be adjusted as per the final provisions. As per Para 7 of the O.M. the accumulations in pension wealth of deceased employee under NPS will not be paid during the period provisional benefits under the aforementioned O.M. are payable.

The Head of Office will prepare the pension papers as per provisions of the relevant rules and proceed as per the procedure for making the provisional payment to eligible Government servants’ families explained in Ministry of Finance O.M. No. 1(7)/DCPS(NPS)/2009/TA/221 dated 2.7.2009 read with corrigendum dated 29.9.2009.

29.

What is the full form of NPS?

Answer»

National Pension Scheme is the full form of NPS.

30.

What are the guidelines/orders in regard to settlement of dues of the deceased Government employees covered under NPS ?

Answer»

As per the Department of Pension & PW O.M. No.38/41/06 –P&PW(A) dated 5.5.2009 (available on website) the benefits under the CCS(Pension) Rules has been provisionally extended to the families of deceased employees covered under NPS. Family Pension/gratuity in terms of O.M. dated 5.5.2009 shall be payable to the family of the deceased employee if the deceased employee was covered under NPS and fulfils the conditions. These payments are provisional and will be adjusted as per the final provisions. As per Para 7 of the O.M., the accumulations in pension wealth of deceased employee under NPS will not be paid during the period provisional benefits under the aforementioned O.M. are payable. The Head of Office will prepare the pension papers as per provisions of the relevant rules and proceed as per the procedure for making the provisional payments to eligible Government servants’ families explained in Ministry of Finance O.M. No.1(7)/DCPS(NPS)/2009/TA/221 dated 2.7.2009 read with corrigendum dated 29.9.2009. 

31.

Explain embedding audio in Web Pages. Give any four ways to embed audio files in a web page.

Answer»

Embedding audio in Webpages: Embedding a sound on a page means to include the sound commands in the HTML document.

Four ways to embed Audio files in a web page are :

  • Using the Object Tag: tag can be used for embedding various media into our web pages. 
  • Google Reader MP3 Player: Google Reader has an inbuilt MP3 player that is pretty much the same as Gmail player but it also works on non-Google websites. 
  • Yahoo Media Player: The Yahoo Media Player takes a drastically different approach by presenting viewers with a very minimal piece of text and a play button instead of a full-fledged player.
  • Mix Pod: Mix Pod creates a free flash widget to embed into our site.
32.

++ is a ......... operator. (a) Unary(b) Binary (c) Ternary (d) None of these

Answer»

++ is a Unary operator.

33.

Conditional operator is .......... operator. (a) Unary (b) Binary (c) Ternary (d) None of these

Answer»

Conditional operator is Ternary operator.

34.

Write a program to read your height in meter and cm convert it into Feet and inches

Answer»

#include<iostream> 

using namespace std; 

int main( ) 

{

int m,cm; 

float inch; 

int feet; 

cout<<“Enter your height in Centimeter:”; cin>>cm;

cout<<” Your height is “<<cm/100<<” Meters and “<<cm%100<<"cm\n";

inch=cm/2.54;

feet=inch/12; 

inch=(int)inch%12;

cout<<feet<<"feet and"<<inch<<"inch";

}

35.

Following is a sample C++ program. Identify the errors if any in the structure. Correct the program.#include&lt;iostream&gt;using namespace std; int main [ ] { */ It is a simple program */ Cout&lt;&lt;“Welcome to C++”Cout&lt;&lt;“The End” .}

Answer»

The multi line comment used in this program is wrong. So the correct code is as follows

#include<iostream>

using namespace std; 

int main ( ) 

/* It is a simple program */ 

cout<< “Welcome to C++”

cout<< “\nThe End”

}

36.

Define an operator and explain operator in detail.

Answer»

An operator is a symbol that performs an operation. The data on which operations are carried out are called operands. 

Following are the operators 

1. lnput(>>) and output(<<):

These operators are used to perform input and output operation.

eg: cin >>n;

cout<<n;

2. Arithmetic operators: 

It is a binary operator. It is used to perform addition(+), subtraction(-), division (/), multiplication (*) and modulus (%- gives the remainder) operations. 

eg: If x = 10 and y = 3 then

x+yx-yx*yx/yx%y
1373031

x/y = 3, because both operands are integer. To get the floating point result one of the operand must be float.

3. Relational operator: 

It is also a binary operator. It is used to perform comparison or relational operation between two values and it gives either true(1) or false(O). The operators are ,>=,== (equality)and !=(not equal to) eg: If x = 10 and y = 3 then

x<yx<=yx>yx>=yx==yx!=y
FalseFalseTrueTrueFalseTrue

4. Logical operators: 

Here AND(&&), OR(||) are binary operators and NOT(!) is a unary operator. It is used to combine relational operations and it gives either true(1) or false(O). If x=True and y=False then

x||xx||yy||xy||y
TrueTrueTrueFalse

Either one of the operands must be true to get a true value in the case of OR(||) operation If x = True and y = False then

!x!y
FalseTrue

5. Conditional operator: 

It is a ternary operator hence it needs three operands. The operator is ?: Syntax: expression ? value if true : value if false. First evaluates the expression if it is true the second part will be executed otherwise the third part will be executed.

  eg: If x = 10 and y = 3 then x>y ? cout<<x : cout<<y;. Here the output is 10

6. sizeof(): 

This operator is used to find the size used by each data type. 

eg. sizeof(int) gives 2.

7. Increment and decrement operator: 

These are unary operators.

(a) Increment operator (++): It is used to increment the value of a variable by one i.e., x++ is equivalent to x = x + 1; 

(b) Decrement operator (–): It is used to decrement the value of a variable by one i.e., x-is equivalent to x = x – 1.

8. Assignment operator (=): 

lt is used to assign the value of a right side to the left side variable. 

eg: x = 5; Here the value 5 is assigned to the variable x.

37.

Name: Jose Roll no: 20 Age: 17 Weight: 45.650 Consider the above data, we know that there are different types of data are used in the computer. Explain different data types used in C++.

Answer»

1. int data type: 

It is used to store whole numbers without fractional (decimal point) part. It can be either negative or positive. It consumes 4 bytes (32 bits) of memory, i.e. 232 numbers. That is 231 negative numbers and 231 positive numbers (0 is considered as +ve) So a total of 232 numbers. We can store a number in between -231 to + 2311.

2. char data type: 

Any symbol from the keyboard, eg. A’,’9′,…. It consumes one byte( 8 bits) of memory. It is internally treated as integers, i.e. 28 = 256 characters. Each character is having a ASCII code, ‘a’ is having ASCII code 97 and zero is having ASCII code 48.

3. float data type: 

It is used to store real numbers i.e, the numbers with decimal point. It uses 4 bytes(32 bits) of memory. 

eg: 67.89, 89.9 E-15.

4. double data type: 

It is used to store very large real numbers. It uses 8 bytes(64 bits) of memory.

5. void data type: 

void means nothing. It is used to represent a function returns nothing.

38.

Write C++ examples for the following: 1. Declaration statement 2. Assignment statement 3. Type casting

Answer»

1. int age; 

2. age = 16; 

3. avg = (float)a + b + c/3;

39.

Suggest most suitable derived data types in C++ for storing the following data items or statements 1. Age of 50 students in a class 2. Address of a memory variable 3. A set of instructions to find out the factorial of a number 4. An alternate name of a previously defined variable. 5. Price of 100 products in a consumer store 6. Name of a student

Answer»

1. Integer array of size 50 

2. Pointer variable 

3. Function 

4. Reference 

5. Float array of size 100 6. Character array

40.

Rewrite the following using nested switch construct.#include&lt;iostream&gt;using namespace std; int main() { int a,b;cout&lt;&lt;"Enter value for a and b";cin&gt;&gt;a&gt;&gt;b;if(b==0)    cout&lt;&lt;"Divide by zero error";else    if(a==0)    cout&lt;&lt;"The result is zero";else   cout&lt;&lt;"The result is "&lt;&lt;(float)a/b;}

Answer»

#include<iostream>

using namespace std; 

int main() 

int a,b;

cout<<"Enter value for a and b";

cin>>a>>b;

switch(b)

{

case 0 : cout<<"Divide by zero error";

break;

default:

switch(a)

{

case 0:cout<<"The result is zero";

break;

default:

cout<<"The result is "<<(float)a/b;

}

}

}

41.

Considering the following C++ statements. Fill up the blanks 1. If p = 5 and q = 3 then q%p is .............. 2. If E1 is true and E2 is False then E1 &amp;&amp; E2 will be .............3. If k = 8, ++k &lt; = 8 will be ..........4. If x = 2 then (10* ++x) % 7 will be .......5. If t = 8 and m = (n=3,t-n), the value of m will be ......6. If i = 12 the value i after execution of the expression i+ = i- - +- -i will be ........

Answer»

1. 3 

2. False 

3. False(++k makes k = 9. So 9<=8 is false) 

4. 2(++x becomes 3 ,so 10 * 3 = 30%7 = 2) 

5. 5( here m = (n = 3,8-3) = (n = 3,5), so m = 5, The maximum value will take) 

6. Here i = 12

i + = i- – + – -i 

here post decrement has more priority than pre decrement. So “i- -” will be evaluated first. Here first uses the value then change so it uses the value 12 and i becomes 11 

i + = 12 + – -i 

now i = 11. 

Here the value of i will be changed and used so “i- -” becomes 10 

i + = 12 + 10 = 22 

So, i = 22 +10 

i = 32 

So the result is 32.

42.

Costume is derived from word ____ evolving from the environment and customs of society.

Answer»

Costume is derived from word Custom evolving from the environment and customs of society.

custom
43.

Define the term, debugging. Write the names of two phases that are included in debugging. 

Answer»

Debugging: 

The program errors are called ‘bugs’ and the process of detecting and correcting errors is called debugging. 

Compilation and running are the two phases.

44.

Odd man out. a) syntax error b) logical error c) Runtime error d) printer error

Answer»

d) Printer error, Others are different types of errors.

45.

In the following number series only one number is wrong. Find out the wrong number. 8 27 64 125 218 343 (a) 27 (b) 218 (c) 125 (d) 343 (e) None of these

Answer»

(b) The series is (2)3, (3)3, (4)3, (5)3, (6)3, (7)3,
The wrong number is 218
It should be (6)3 = 216

47.

Complete the sentences in reported speech. 1. ‘I will meet you tomorrow’. She said that she _____ me the next day. 2. ‘I can do all this work myself. He said that he _____ himself. 3. ‘Stop telling lies’. She ordered him _____ telling lies.4. ‘We will come to your house tomorrow’. They said that _____ to her house _____ 5. ‘My Dad has left just now’.saru told me that Dad ______

Answer»

1. would meet 

2. could do all that 

3. to stop 

4. they would come; the next day 

5. had left just then

48.

Many people become engineers, doctors, IAS officers, film stars and so on. But few become ‘‘Human” , Look at the pictures. Discuss and answer.1. What makes a person a hero? 2. How do heroes make a difference? 3. Does every hero have to fight or risk their life?

Answer»

1. A person becomes a hero, if he risks his / her life for the sake of others.

2. A hero is a person of distinguished courage and ability. They are admired for their brave deeds and noble qualities.

3. No, not every hero has to fight or risk his life. If he values humanity and does his best, he is a hero.

49.

Punctuate the following,1. what a wonderful sight it is said anu.2. she bought some pens pencils erasers and scale from the stationery shop.3. get up it is getting late said her mother.4. dont shout in the classroom keep quiet said the teacher.5. what are you doing here asked the watchman.

Answer»

1. “W hat a wonderful sight it is said A nu

2. She bought some pens pencils erasers and scale from the stationery shop

3. “G et up I is getting late” said her mother

4. “Don t shout in the classroom keep quiet” said the teacher

5. “What are you doing here asked the watchman

50.

A motor boat, whose speed is 15 km/hr in still water goes 30 km downstream and comes back in a total of 4 hrs 30 mins. The speed of the stream (in km/hr) is:-1. 5 km/hr.2. 10 km/hr.3. 15 km/hr.4. 20 km/hr.5. 25 km/hr.

Answer» Correct Answer - Option 1 : 5 km/hr.

Given:

Speed in still water = 15 km/hr

Total distance = 30 km

Total time = 4 hrs 30 mins = 412 hr = 9/2 hr.

Formula used:

Distance = Speed × Time 

Calculation:

Let the speed of the of the stream be X km/hr

Speed upstream = (15 – X) km/hr

Speed downstream = (15 + X) km/hr 

According to question:

[30/(15 + x) + 30/(15 X)] = 9/2

(450 30X + 450 + 30X) / (15 + X) × (15 X) = 9/2

900 = [(152 – X2) × 9/2]

(900 × 2/9) = 225 – X2

X2 = 225 200

X2 = 25

x = 5

Speed of the stream is 5 km/hr.

If the speed of boat or swimmer is X km/hr and the speed of the stream is y km/hr then,

Speed of boat upstream = (X Y) km/hr.

Speed of boat downstream = (X + Y) km/hr.