DRDO STA Computer Science Tier 1 Mock Test - 3 Free Online Test 2026

The cost of an article was Rs.75. The cost was first increased by 20% and later on it was reduced by 20%. The present cost of the article is:

Three pipes A, B, and C can fill a cistern in 10 hrs. After working together for 4 hours, C is closed, and A and B fill the cistern in 9 hrs. Then find the time in which the cistern can be filled by pipe C?

The average age of a man and his son is 54 years. The ratio of their ages is 23:13. What will be the ratio of their ages after 6 years?

Diameter of the cylindrical vessel is 14 cm. having some water. When a sphere of iron is totally submerged in this water level of water increased by cm. What is the radii of the sphere?

A shopkeeper makes a profit of 20% by selling a T.V. What would be the new profit percent if the shopkeeper paid 15% less for the T.V and the customer paid 10% more for the T.V?

The value of tan 4⁰. tan 43⁰ .tan 47⁰ .tan 86⁰ is-

What is the unit digit of (254+145)⁴²?

There are two sets of figures namely problem Figure containing five figures 1, 2, 3, 4, 5 and answer figures (a), (b), (c), (d). You have to select one Figure from the answer set which will continue the same series as given in problem set figures.

DIRECTIONS: A piece of paper is folded and cut as shown below in the questions figure. From the given answer figures, indicate how it will appear when opened?

How many triangles are present in the given figure?

DIRECTIONS: Each of the following questions consists of five figures marked A, B, C, D and E if called the Problem figures followed by five other figures marked 1, 2, 3 and 4 called the Answer Figures. Select a figure from amongst the Answer Figures which will continue the same series as established by the five Problem Figures.

A, B, C, D and E each has different heights. D is only shorter than B. E is shorter than A and C. Who is the shortest of them?

In a certain code language 'POULTRY' is written as 'PRQXNVTY'. How is 'TREASON' written in that code?

DIRECTIONS: Solve the following letter series.

adb _ ac _ da _ cddcb _ dbc _ cbda

In a certain code language, ‘nick muk pic’ means ‘brave and concern’, ‘ill dic so’ means ‘every body else’ and ‘tur muk so’ means ‘body and soul’. Which of the following may mean ‘and every soul’?

In a code language ‘S1357’ means ‘SWe are very happy’, ‘S2639’ means ‘Sthey are extremely lucky’ , and ‘S794’ means ‘SHappy and lucky’. Which digit in that code language stands for ‘Svery’?

Arrange the given words in a meaningful sequence.

1. Kilogram

2. Gram

3. Ton

4. Quintal

Which one of the given responses would be a meaningful order of the following ?

1- Wall

2- Clay

3- House

4- Room

5- Bricks

Rahul and Robin are brothers. Pramod is Robin’s father. Sheela is parmod’s sister. Prema is pramod’s niece. Shubha is Sheela's grand-daughter. How is Rahul related to Shubha?

The filament of electric bulb is made of ___

Weight of the body is?

Which of the following compound contains only Carbon & Hydrogen atoms in their formation?

When a bottle of perfume is opened in one corner of a room the smell spreads throughout the room. This is an example of _______.

Light Year is a unit to measure -

Which of the following is not a colloid?

The most abundant metal in the earth’s crust is-

In the following sentence, a part of the sentence is underlined. Below are given alternatives to the underlined part, which may improve the sentence. Choose the correct alternative. In case no improvement is needed, choose the option ‘No improvement’.

Q. Due the advantages inherent in using sales taxes, it is not surprising that some believe that the economy should base the entire tax system on sales taxes rather than income taxes.

Direction: Read the following passage carefully and answer the questions. Your answer to these questions should be based on passage only.
Mandela recollects that it was almost impossible for a black man in south Africa to fulfill his obligation to his family and society because of the system of apartheid practiced by the white rulers. He began to hanker after freedom when he realized that his freedom had been taken away from him when he reached manhood. He yearned for the basic and honorable freedoms of achieving his potential, of marrying, having a family-the freedom not to be obstructed in a lawful life. When Mandela realized that not only his freedom was curtailed, but the freedom of everyone who looked like him was also curtailed. That's when he joined the African national Congress and that is when the hunger for his own freedom became the greater hunger for the freedom of his people.

Q. Whose concern does this passage voice?

In the following question, the sentence with blank is to be filled with appropriate word. Select the correct alternative out of the four and indicate it by selecting the appropriate option.

Q. Previously, she was one of the three Deputy Director-Generals supporting the Director-General in ________ all programmes.

In the following question, some part of the sentence may have errors. Find out which part of the sentence has an error and select the appropriate option. If a sentence is free from error, select 'No Error'. 

Q. I am disappointed to (1)/ see that neither of the (2)/ websites have any offers. (3)/ No error (4)