The electric field in a region of space is given by $$\vec{E}=(\hat{5i}+\hat{2j}  )Nc^{-1}$$ . The electric flux due to this field through an area $$2m^{2}$$ lying in the Y-Z plane in S.I. units is

1) 2√29
2) 20
3) 10√2
4) 10

 An electron of 10 eV kinetic energy will travel the distance through an electric field 0.25 N/C :

(1) 2.5 m
(2) 20 m
(3) 4 m
(4) 40 m

The rest mass of a photon is:

(1) Dependant on velocity
(2) Zero
(3) Very large
(4) Very small

A wind with speed 40 m/s blows parallel to the roof of a house. The area of the roof is 250 m². Assuming that the pressure inside the house is atmospheric pressure, the force exerted by the wind on the roof and the direction of the force will be: ( ρair=1.2 kg/m³)

1) 4.8×10⁵N, upwards

2) 2.4×10⁵N upwards

3) 4.8×10⁵N downwards

4) None of these

Two full terms of the circular scale of a screw gauge cover a distance of 1mm on its main scale. The total number of divisions on the circular scale is 50. Further, it is found that the screw gauge has a zero error of −0.03mm. While measuring the diameter of a thin wire, a student notes the main scale reading of 3mm and the number of circular scale divisions in line with the main scale as 35. The diameter of the wire is

1) 3.32mm
2) 3.73mm
3) 3.67mm
4) 3.38mm

The length of potentiometer wire is 10 cm. and resistance is 0.005 ohm /cm. A battery of 2 Volt emf and 1.5  ohm internal resistance is connected to the wire will have potential gradient :

(1) 4 x 10^-4 v/cm.
(2) 0.05 v/cm.
(3) 0.5 v/cm.
(4) 0.005 v/cm.

An object is projected up wards with velocity of 100 m/sec. it will strike the ground in approximately ( g=10 m/sec2)
1) 10 sec
2) 5 sec
3) 15 sec
4) 20 sec

Two resistors are connected in series across a potential difference. Resistor A has twice the resistance of resistor B. If the current carried by resistor A is I, what is the current carried by resistor B?

(1) I

(2) 2I

(3) I/2

(4) 4I

In a compound microscope, the focal lengths of two lenses are 2.5 cm and 6.25 cm. An object is placed at 2 cm from objective and the final image is formed at 25 cm from eye lens. The distance between the two lenses is:
1.12 cm
2.15 cm
3.18 cm
4.None of the above

The number of photo electrons emitted for light of a frequency v (higher than the threshold frequency v0) is proportional to :

1) Frequency of light (v)
2) $$v-v_0$$
3) $$Threshold\;frequency\;(v_0)$$
4) Intensity of light