Class 10th Hardest PHYSICS MCQ's

AS YOU MOVE AWAY FROM A CONVEX MIRROR , ITS IMAGE BECOME ____________ AND MOVES TOWARD___________.

• SMALLER , INFINITY

• SMALLER , FOCUS

• ENLARGED , INFINITY

• ENLARGED , FOCUS

FOR A SPHERICAL MIRROR __________ IS TRUE.

• f = 2R

• R = 2f

• fR = 1/2

• fR = 2

WHAT IS f IF YOU HAVE AN OBJECT 2 M FROM THE CONCAVE MIRROR AND THE IMAGE IS 4 M FROM THE MIRROR.

• 2.0 M

• 0.67 M

• -1.3 M

• -4.0 M

A CONVERGENT LENS OF POWER 8D IS COMBINED WITH A DIVERGENT LENS OF POWER -10D . CALCULATE THE FOCAL LENGTH OF THE COMBINATION .

• -0.5

• -1.5

• -2

• 2

BLUE COLOR OF THE SKY IS DUE TO _______

• SCATTERING OF LIGHT

• REFLECTION OF LIGHT

• REFRACTION OF LIGHT

• DIFFRACTION OF LIGHT

Tags

NGSS.MS-PS4-2

A CONCAVE LENS OF SUITABLE FOCAL LENGTH IS USED FOR CORRECTING A :

• MYOPIC EYE

• HYPERMETROPIC EYE

• BOTH A & B

• NEITHER A & B

THE CHANGE OF FOCAL LENGTH OF AN EYE LENSTO FOCUS THE IMAGE OF OBJECTS AT VARYING DISTANCE IS DONE BY THE ACTION OF ________

• PUPIL

• RETINA

• CILIARY MUSCLE

• BLIND SPOT

THE PROPERTY OF PERSISTENCE OF VISION IS USED IN

• SHORT SIGHTEDNESS

• LONG SIGHTEDNESS

• CINEMATOGRAPHY

• COLOUR VISION

Tags

NGSS.HS-PS4-5

WHEN A 40V BATTERY IS CONNECTED ACROSS AN UNKNOWN RESISTOR THERE IS A CURRENT OF 100mA IN THE CIRCUIT . FIND THE VALUE OF THE RESISTANCE OF THE RESISTOR :

• 500 ohm

• 800 ohm

• 0.8 ohm

• 400 ohm

A BATTERY OF 6V IS CONNECTED IN SERIES WITH RESISTOR OF 0.1 ohm , 0.15 ohm , 0.2 ohm , 0.25 ohm AND 6 ohm .

HOW MUCH CURRENT WOULD FLOW THROUGH THE 0.3 ohM RESISTOR ?

• 0.895 A

• 2.22 A

• 1 A

• NONE OF THESE