HOME TEST-6

Two plane mirrors are set at right angle and a flower is placed in between the mirrors. The number of images of the flower which will be seen is

• One
• Two
• Three
• Four

A man is 6.0 feet tall. What is the smallest size of plane mirror he can use to see his entire image

• 3.0 feet
• 6.00 feet
• 12 Feet
• 24 Feet

There is an Equiconvex lens of focal length 20 cm. if the lens is cut into two equal parts perpendicular to the principal axis, the focal length of each part will be

• 20cm
• 10cm
• 40cm
• 15cm

A bright X(cross) mark is made on a sheet of white paper. Over the white paper a rectangualr glass-slab of thickness 3cm is placed. On looking through, the image of the mark appears above the mark. it is below the upper surface of the slab by

• 2.5 cm
• 1.5cm
• 2cm
• 1.75cm

Out of the following (a) pole (b) focus (c) radius of curvature (d) principal axis for a spherical mirror, the quantities that do not depends on whether the rays are paraxial or not, are

• a,b,c and d
• only a,b and c
• only a,c and d
• only a and d

The radius of curvature of thin plano-convex lens is 10cm (of curved surface) and refractive index is 1.5. if the plane surface is silvered, then it behaves like a concave mirror of focal length

• 10cm
• 15cm
• 20cm
• 5cm

A Converging lens of focal length 12cm is placed at a distance 'd' to the right of the diverging lens. find the distance 'd'.

• Option 1
• 200 J
• 1600 J
• 600 J

A boy of mass 50 kg runs up a staircase of 45 steps in 9 sec. If the height of each step is 15 cm. Find his power. (Use g = 10 m/ s^2)

• 275 W
• 350 W
• 325 W
• 375 W

Then kinetic energy of a body becomes 4 times of its initial value. The new linear momentum will be

• same as initial momentum
• four times the initial momentum
• two time the initial momentum
• eight times the initial momentum

The value of 1 kilowatt power in terms of horse power will be

• 1.34 hp
• 746 hp
• 1 hp
• 4.36 hp