Railway RRB / NTPC - MCQ Practice Questions

According to the Doppler effect, what happens to the frequency of sound when a source moves towards an observer?

Which law of thermodynamics states that energy cannot be created or destroyed?

Which of the following is not a state of matter?

What is the atomic number of Carbon?

Which of the following best describes the process of photosynthesis?

Which of the following is an endothermic reaction?

What is the main component of natural gas?

Which of the following organs is responsible for filtering blood and producing urine?

According to Newton's third law of motion, for every action there is:

Which of the following statements about sound waves is incorrect?

Which of the following elements has the highest electronegativity according to the Pauling scale?

Which of the following is a non-renewable source of energy?

Which hormone is responsible for regulating blood sugar levels in humans?

If a 5 kg object is lifted to a height of 2 meters, what is the gravitational potential energy gained? (g = 10 m/s²)

The pH scale ranges from:

Which of the following exhibits both wave and particle properties?

At what temperature do Celsius and Fahrenheit scales show the same numerical value?

If the speed of light is 3 × 10⁸ m/s and light travels for 2 seconds, what distance does it cover?

Which of the following is an example of an endothermic reaction?

The focal length of a convex mirror is 20 cm. What is its radius of curvature?