RRB GROUP D

If the perimeter of one face of a cube is 24 cm, then its volume is:

• 216 cm³

• 154 cm³

• 180 cm³

• 200 cm³

Answer explanation

The perimeter of one face of a cube is 24 cm, so each side length is 24 cm / 4 = 6 cm. The volume of a cube is side³, thus 6³ = 216 cm³. Therefore, the correct answer is 216 cm³.

Study the given diagram carefully and answer the question. The numbers in different sections indicate the number of persons. Which of the following statements is correct on the basis of the above diagram?

• The number of girls who are also gymnasts is 41.

• The number of gymnasts who are also medal winners is 34.

• The number of medal winners who are also girls is 27.

Answer explanation

The correct statement is that the number of gymnasts who are also medal winners is 34, as indicated in the diagram. The other statements about girls and medal winners do not match the numbers shown.

In this question, a statement is followed by two conclusions. Which of the two conclusions is/are true with respect to the statement? Statement: P ≤ Q < F = R ≥ M = B Conclusions:

• Only conclusion I is true

• Both conclusions I and II are true

• Neither conclusion I nor II is true

• Only conclusion II is true

Answer explanation

The statement indicates a relationship among variables. Conclusion I is true as it aligns with the given relationships. Conclusion II is not supported by the statement. Therefore, only conclusion I is true.

As atomic number increases and nuclear charge increases, the force of attraction between nucleus and valence electrons increases, hence atomic radii decreases from Li to F.

• increases, decreases, decreases, increases

• increases, increases, increases, decreases

• decreases, decreases, decreases, increases

• increases, increases, decreases, decreases

Answer explanation

As atomic number increases, nuclear charge increases, enhancing the attraction between the nucleus and valence electrons. This results in a decrease in atomic radii from Li to F, making the correct choice 'increases, increases, decreases, decreases'.

(a)   is the nodal agency for releasing data related to national income, consumption expenditure, savings, and capital formation since 1956.

• Monetary Policy Office

• Central Financial Office

• Public Asset Management Office

• Central Statistics Office

Answer explanation

The Central Statistics Office (CSO) is the nodal agency responsible for releasing data on national income, consumption expenditure, savings, and capital formation since 1956, making it the correct choice.

Srinivas has just got married to a girl who is 4 years younger than him. After 5 years their average age will be 33 years. Find the present age of the girl.

• 31 years

• 26 years

• 30 years

• 35 years

Answer explanation

Let Srinivas's age be x. Then, the girl's age is x - 4. In 5 years, their ages will be x + 5 and x - 4 + 5. The average age will be 33: (x + 5 + x + 1)/2 = 33. Solving gives x = 30, so the girl is 26.

The Indian Constitution gives the President the authority to declare three types of emergencies. Which of the following is NOT among them?

• Article 352 - National Emergency

• Article 356 - Emergency in State (President's rule)

• Article 358 - Public health emergency

• Article 360 - Financial Emergency

Answer explanation

Article 358 does not exist in the Indian Constitution. The three types of emergencies are National Emergency (Article 352), President's Rule (Article 356), and Financial Emergency (Article 360). Thus, Article 358 is the correct answer.

In February 2022, who launched the ICMR/DHR Policy on Biomedical Innovation?

• Mansukh Mandaviya

• Nitin Gadkari

• Amit Shah

• Narendra Modi

Answer explanation

Mansukh Mandaviya, the Union Minister of Health and Family Welfare, launched the ICMR/DHR Policy on Biomedical Innovation in February 2022, emphasizing the importance of innovation in healthcare.

One year ago, the ratio of the ages of Saketh and Tilak was 5:6, respectively. Four years hence, this ratio would become 6:7. The present age of Saketh is:

• 30 years

• 31 years

• 25 years

• 26 years

Answer explanation

Let Saketh's age be 26. One year ago, Saketh was 25 and Tilak was 30 (5:6 ratio). In four years, Saketh will be 30 and Tilak 34, giving a 6:7 ratio. Thus, the present age of Saketh is 26 years.

Which is a quadratic equation?

Answer explanation

A quadratic equation is of the form ax^2 + bx + c = 0. The correct choice, (x + 3)^2 = 0, is a quadratic equation since it can be expanded to x^2 + 6x + 9 = 0, fitting the standard form.