Search Previous Year Questions

Find real questions from previous competitive exam papers with answers and solutions.

Browse complete papers
1050 matching questions · Page 13
Clear

Question 121

Railway GDCE 2019• Part B

The efficiency of a heat engine can never be

  1. AOption (a)

    10%

  2. BOption (b)

    80%

  3. COption (c)

    100%

  4. DOption (d)

    50%

View answer & explanation

Correct answer

Answer: (a)A.

10%

Explanation not yet available.

Question 122

Railway GDCE 2019• Part B

Which of the following is a Pythagorean triplet?

  1. AOption (a)

    15, 17, 7

  2. BOption (b)

    9, 12, 17

  3. COption (c)

    12, 13, 8

  4. DOption (d)

    8, 15, 17

View answer & explanation

Correct answer

Answer: (a)A.

15, 17, 7

Explanation not yet available.

Question 123

Railway GDCE 2019• Part B

At what temperature is the velocity of sound in air is twice its velocity at 30°C? 

  1. AOption (a)

    1212°C 

  2. BOption (b)

    120°C 

  3. COption (c)

    60°C 

  4. DOption (d)

    939°C 

View answer & explanation

Correct answer

Answer: (a)A.

1212°C 

Explanation not yet available.

Question 124

Railway GDCE 2019• Part B

The points (2, 0); (4, 3) & (6, y) are collinear. find y.

  1. AOption (a)

    5

  2. BOption (b)

    8

  3. COption (c)

    -1

  4. DOption (d)

    6

View answer & explanation

Correct answer

Answer: (a)A.

5

Explanation not yet available.

Question 125

Railway GDCE 2019• Part B

If (x - √2) and (x + √2), are a factor of x4 - 7x3 + 10x2 + 14x - 24.

Find other factors.

  1. AOption (a)

    (x - √3), (x - 4)

  2. BOption (b)

    (x - 3), (x + 4)

  3. COption (c)

    (x - 4), (x - 6)

  4. DOption (d)

    (x - 3), (x - 4)

View answer & explanation

Correct answer

Answer: (a)A.

(x - √3), (x - 4)

Explanation not yet available.

Question 126

Railway GDCE 2019• Part B

Which among the given alphabets will not get laterally inverted on reflection by a plane mirror?

  1. AOption (a)

    P

  2. BOption (b)

    N

  3. COption (c)

    M

  4. DOption (d)

    L

View answer & explanation

Correct answer

Answer: (a)A.

P

Explanation not yet available.

Question 127

Railway GDCE 2019• Part B

A ball is thrown upwards from point A, with a velocity of 15 m/s, and it comes back from its highest point B, to the ground after some time. The magnitude of the acceleration of the ball at its highest point B will be

  1. AOption (a)

    g

  2. BOption (b)

    g/2

  3. COption (c)

    -g

  4. DOption (d)

    0

View answer & explanation

Correct answer

Answer: (a)A.

g

Explanation not yet available.

Question 128

Railway GDCE 2019• Part B

Value of sin (45° + x) + sin (45° - x) = 

  1. AOption (a)

    √3 cos x 

  2. BOption (b)

    √3 sin x 

  3. COption (c)

    √2 cos x 

  4. DOption (d)

    √3 cot x 

View answer & explanation

Correct answer

Answer: (a)A.

√3 cos x 

Explanation not yet available.

Question 129

Railway GDCE 2019• Part B

The focal length of a convex lens is 'f' What should be the minimum distance between the object and the screen so that a real image is formed.

  1. AOption (a)

    3f

  2. BOption (b)

    2f

  3. COption (c)

    5f

  4. DOption (d)

    4f

View answer & explanation

Correct answer

Answer: (a)A.

3f

Explanation not yet available.

Question 130

Railway GDCE 2019• Part B

The value of the radius of earth changes from R to a new value such that the value of acceleration due to gravity on the surface of earth increases by 2%. If there is no accompanying change in mass of earth, the new value of the radius of the earth is

  1. AOption (a)

    (0.99) R

  2. BOption (b)

    (1.01) R

  3. COption (c)

    (1.02) R

  4. DOption (d)

    (0.98) R

View answer & explanation

Correct answer

Answer: (a)A.

(0.99) R

Explanation not yet available.
Page 13