The diffraction pattern of a single slit is shown in figure. The point at which the path difference of the extreme rays is two wavelengths is

(A) Point 1 

(B) Point 2 

(C) Point 4 

(D) Point 5

Which frequency produces a sound that can be heard by a person? 

(A) 100 kHz 

(B) 40 kHz 

(C) 2 kHz 

(D) 30 kHz

Light from the Sun passes through a prism and a spectrum is produced on a screen. A thermometer placed at point X shows a temperature increase. For the given diagram, which type of radiation causes this temperature increase? Select the most appropriate option. 

(A) Infra-red Rays 

(B) X-rays 

(C) Ultraviolet Rays 

(D) Visible light

The displacement-time (x-t) graph of a body is given as

The corresponding velocity-time (v-t) graphwill be

Point charges 30 C, –20 C and 10 C are located at (–1, 0, 2), (0, 0, 0) and (1, 5, –1) respectively. The total electric flux leaving cube of side 6 m centered at the origin is

(A) -20/ɛ₀

(B) 10/ɛ₀

(C) 20/ɛ₀

(D) 20/ɛ₀

Which of the following is optically active molecule?

Which of the following molecules is optically active ?

(A) (i) and (ii) 

(B) (i) and (iii) 

(C) (ii) and (iii) 

(D) (i), (ii) and (iii)

A method of removing excess solute from a colloidal solution is 

(A) Distillation 

(B) Crystallization 

(C) Dialysis 

(D) Gas chromatography

For given LR circuit, growth of current as function of time t is shown in graph. Which of the following option represents value of time constant most closely for the circuit?

(A) 0.4 s 

(B) 0.7 s 

(C) 1 s 

(D) 2.4 s 

The velocity of a particle is zero at time t= 2 , then 

(A) acceleration must be zero at t= 2 

(B) displacement must be zero in the interval t = 0 to t = 2. 

(C) acceleration may be zero at t= 2 

(D) velocity must be zero for t> 2