<<45678
36.

 The  terminal speed of a sphere of gold (density =19.5 kg/m3) is 0.2 m/s ina viscous  liquid (density =1.5 kg/m3) , find the terminal speed of a sphere of silver (density= 10.5 kg/m3) of the same size in the same liquid 

 


A) 0.4 m/s

B) 0.133 m/s

C) 0.1 m/s

D) 0.2 m/s



37.

 In given circuit, C1=C2=C3= C  initially Now a dielectric slab of dielectric constant   $K=\frac{3}{2}$  is inserted in C2

1652021554_p1.JPG

 

The equivalent capacitance become


A) $\frac{5C}{7}$

B) $\frac{7C}{5}$

C) $\frac{2C}{3}$

D) $\frac{C}{2}$



38.

In Wheatstone bridge, 4 resistors P=10Ω, Q= 5Ω, R=4Ω, S=4Ω  are connected in cyclic order.To ensure no current through galvanometer


A) $5\Omega$ resisttance is connected in series Q

B) $4\Omega$ resistance is connected parallel to S

C) $10\Omega$ resistance is connected in series with P

D) $4\Omega$ resistance is connected in series with R



39.

 In photoelectric  effect, initally when energy of electrons emitted is E0 , de-Broglie wavelength associated with them is $\lambda$0 , Now , energy is doubled then associated de-Broglie wavelength $\lambda$' is 


A) $\lambda^{'}=\frac{\lambda_{0}}{\sqrt{2}}$

B) $\lambda^{'}=\sqrt{2}\lambda_{0}$

C) $\lambda^{'}=\lambda_{0}$

D) $\lambda^{'}=\frac{\lambda_{0}}{2}$



40.

The potential energy of system increase if work is done


A) upon the system by a non conservative force

B) by the system against a conservative force

C) by the system against a non conservative force

D) upon the system by a conservative force



<<45678