Test 01

 2 mark

| -0.25 mark |

 20 minutes

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Question 1:

A real number \( x \) is such that the sum of the number and four times its square is the least. What is that number?

Question 2:

The difference of the square of two natural numbers \(m\) and \(n\) (\(m>n\)) is 72. How many pairs of natural numbers will satisfy?

Question 3:

None

Question 4:

Let \( N \) be a 5-digit number. When \( N \) is divided by \( 6,12,15,24 \) it leaves respectively \( 2,8,11,20 \) as remainders. What is the greatest value of \( N \)?

Question 5:

What are the last three digits in the multiplication of \( 4321012345 \times 98766789 \)?

Question 6:

\( p \) varies directly as \( \left(x^{2}+y^{2}+z^{2}\right) \). When \( x=1, y=2, z=3 \), then \( p=70 \). What is the value of \( p \) when \( x=-1, y=1 \), \( z=5 \)?

Question 7:

Let \( N \) be the least positive multiple of 11 that leaves a remainder of 5 when divided by \( 6,12,15,18 \). Which one of the following is correct?

Question 8:

What is \( \frac{1}{\sqrt{10}+\sqrt{9}}+\frac{1}{\sqrt{11}+\sqrt{10}}+\frac{1}{\sqrt{12}+\sqrt{11}}+\ldots+\frac{1}{\sqrt{196}+\sqrt{195}} \) equal to?

Question 9:

Train \( X \) crosses a man standing on the platform in 24 seconds and train \( Y \) crosses a man standing on the platform in 18 seconds. They cross each other while running in opposite directions in 20 seconds. What is the ratio of speed of \( X \) to speed of \( Y \) ?

Question 10:

What is the maximum value of \( 8 \sin \theta-4 \sin^{2} \theta \)?

Question 11:

What is \( (1+\tan \alpha \tan \beta)^{2}+(\tan \alpha-\tan \beta)^{2} \) equal to?

Question 12:

Consider the following statements:
I. \( \tan 50^{\circ}-\cot 50^{\circ} \) is positive
II. \( \cot 25^{\circ}-\tan 25^{\circ} \) is negative
Which of the statements is/are correct?