User Forum

Which of the following practices concerning plastics is not advisable?

A Plastic bags must be recycled properly.
BPlastic bags must not be used for storing eatables.
CHousehold waste should be thrown away in plastic bags.
DShopkeepers should be discouraged from using plastic bags.

An iron bar is placed near a magnet as shown.

Which diagram correctly shows the induced magnetisation of the iron bar?

(A)

(B)

(C)

Read the given statements and select the correct option.
Statement 1: Digestion and blood circulation are some voluntary actions of our body.
Statement 2: Voluntary actions are the actions which are not under human control.

A Both statements 1 and 2 are correct and statement 2 is the correct explanation of statement 1.
B Both statements 1 and 2 are correct but statement 2 is not the correct explanation of statement 1.
C Statement 1 is true but statement 2 is false.
D Both statements 1 and 2 are false.

A cavity of radius R/2 is created in a sphere of radius R and mass M at the periphery and this mass is placed at a distance 2R from the centre of the sphere as shown in figure. The force between the two is


A

B

C

D

A hollow cylinder of height 1 m whose both crosssections are closed with a membrane of negligible mass, just floats without sinking in a liquid of density 1.9 × 10³ kg m^-3. If the outer diameter and the density of the cylinder are 1 m and 10⁴ kg m^-3 respectively, then the inner diameter of the cylinder will be

A0.3 m
B0.5 m
C0.8 m
D0.9 m

Two identical satellites SI and SII revolve round the earth in circular orbits at distance R and 3R respectively from the surface of the earth, where R is the radius of the earth. The ratio of linear momenta of SII to SI is

A√3 : 1
B1 : 3
C2 : 1
D1: √2

Two cylinders of same cross-section and length L but made of two materials of densities ρ1 and ρ2 are cemented together to form a cylinder of length 2L. If the combination floats in water with a length L/2 above the surface of water and ρ1 < ρ2, then

Aρ1 > 1 g cm^–3
Bρ1 > 3/2 g cm^–3
Cρ1 < 8/9 g cm^–3
Dρ1 < 3/4 g cm^–3

The given diagram shows a barometer.

If the atmospheric pressure is 76 cm Hg, then what is the value of h?

A75 cm Hg
B76 cm Hg
C77 cm Hg
D80 cm Hg

The diagram shows identical lamps X and Y connected in series with a battery. The lamps light with normal brightness. A third lamp Z is connected in parallel with lamp X. What happens to the brightness of lamp Y?


A Brighter than normal
B Normal
C Dimmer than normal
D Very dim (cannot be seen).

A drunkard is walking along a straight road. He takes 5 steps forward and 3 steps backward and so on. Each step is 1 m long and takes 1 s. There is a pit on the road 11 m away from the starting point. The drunkard will fall into the pit after

A 21 s
B 29 s
C 31 s
D 37 s.