RRB JE ECE (CBT I) Mock Test- 8 - Electronics and Communication Engineering (ECE) MCQ

A does 60% of the work in 45 days. He then calls B, and they together finish the remaining work in 18 days. How long B alone would take to do the whole work?

Abhinash gets 32% marks out of 300 in computer Science. How much marks out of 200 he should get in java language paper so that out of total marks his percentage becomes 46% -

There are two taps P and Q that can fill a tank in 12 and 24 minutes respectively. Both of them are opened together and after 4 minutes Q is closed. How long does it take for P alone to fill the tank?

Find the compound interest on a sum of Rs 425 compounded half yearly for 2 years at the rate of 4%.

Average age of 6 boys is 14 years. The average age of 11 girls is 12 years. What is the average age (in years) of all boys and girls?

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

Profit obtained from selling an article for Rs 310 equals the loss incurred on selling that article for Rs 230. What will be the loss percentage when the selling price is Rs 180?

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 increases by 913 cm. What is the radius of the sphere?

The given figure, AB = 16 cm, AC = 12 cm, BC = 14 cm, then the length of median AD will be -

Directions: Each question is followed by 2 statements. Go through these questions and answer the questions as per the instructions : choose your answer as: (A) If the question can be answered by using only statement (I), but not by using statement (II) alone. (B) If the question can be answered by using only statement (II), but not by using statement (I) alone. (C) If the question can be answered by using both the statements together, but cannot be answered by using either statement alone. (D) If the question cannot be answered by using both the statements together.

What is the number?

A. The product of two digits of a number is 27.

B. The sum of the two digits is 12. The ratio of the ten's digit to the unit digit is 3:1.

Two places R and S are 800 km apart from each other. Two persons start from R towards S at an interval of 2 hours. Whereas A leaves R for S before B. The speeds of A and B are 40 km/h and 60 km/h respectively. B overtakes A at M, which is on the way from R to S. What is the distance from R, where B overtakes A?

The area of a square is 72.25 cm² . Find its perimeter (in cm).

Arrange the fractions 3/4, 5/12, 13/16, 16/29, 3/8 in their ascending order of magnitude.

The concentration of acid in two solutions A and B is 19 percent and 9 percent respectively.In what ratio solution A and B should be mixed to get a solution having 17 percent acid?

Find the greatest number which on dividing 1580 and 3800 leaves remainders 8 and 1 respectively

What must be added to each term of the ratio 2 : 5 so that it may equal to 5 : 6 ?

The angle of elevation of the top of a tower at a distance of 25 m from its foot is 60⁰. The approximate height of the tower is -

How many whole numbers are there between 52 and 356 which are exactly divisible by 6?

Directions: In the following problems, there is one question and some statements given below the question. You have to decide whether the data given in the statements is sufficient to answer the question. Read all the statements carefully and find out which of the statements is/are sufficient to answer the given question. Choose the correct alternative for each question.

Question:

What will be the total weight of 10 poles, each of the same weight ?

Statements:

I. One-fourth of the weight of each pole is 5 kg.

II. The total weight of three poles is 20 kilograms more than the total weight of two poles.

B starts some business by investing Rs 90000. After 4 months, D joins the business by investing Rs 80000. At the end of the year, in what ratio will they share the profit?

Calculate the total numbers of prime factors in the expression (9)¹¹ × (5)⁷ × (3)² × (17)²

What is the net discount (in %) for successive discounts of 30% and 50%?

In a mixture of 45 litres, the ratio of liquid A and liquid B is 7 : 2. If 11 litres of liquid B is added to the mixture, then what will be the ratio of liquid A and liquid B in the new mixture?

- 5/3 = -1/6, then the value of x is:

A shopkeeper offers a Rs. 19% discount on a mobile phone with a marked price of Rs. 7400. If he still earns a profit of Rs. 500, what is the cost price of the phone?

The following equation is incorrect. Which two signs should be interchanged to correct the equation?

12 + 8 - 25 ÷ 10 x 18 = 14

Two pipes can fill a tank in 1hr. and 72 min respectively. Both the pipes are open together but due to some dust in the pipe, the efficiency pipes are decreased to 5/6 and 9/10 of their actual efficiency respectively. After some time the dust in both pipes get clear together and both pipes run with their full efficiency and then the tank can be filled in 31 min. Find out how much time it takes to clear dust.