English Medium Science Questions and Answers!

In 1905, Albert Einstein discovered.

(A) Photoelectric effect and Brownian motion
(B) Brown motion and special theory of relativity.
(C) Special theory of relativity and photoelectric effect.

Photoelectric effect, special theory relativity and Brownian motion

1. Dynamic lift of airplane is based on the principle of Bernoulli's theorem.
2. Glass is less elastic than rubber.
3. For a system free from external forces, linear momentum of the system remains constant. Which of the above statement is/are wrong?

(A) 2 only
(B) Both 2 and 3
(C) 3 only
(D) Both 1 and 2

A rocket 100m long at rest starts to move  with uniform motion of 0.8C. What is its length as seen by an observer at rest?

(A) 60cm
(B) 80cm
(C) 100cm
(D) 0

Which of the following has the highest ionizing power?

(A) X-rays
(B) Alpha rays
(C) Beta rays
(D) Gamma rays

Sound waves from a sounding car are. 

(A) Transverse waves
(B) Longitudinal waves
(C) Ultrasonic waves
(D) Stationary waves.

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