1
NEET 2016 Phase 1
+4
-1
Coefficient of linear expansion of brass and steel rods are $$\alpha$$1 and $$\alpha$$2. Lengths of brass and steel rods are $$l$$1 and $$l$$2 respectively. If ($$l$$1 $$-$$ $$l$$2) is maintained same at all temperatures, which one of the following relations holds good?
A
$$\alpha$$1$$l$$2 = $$\alpha$$2 2$$l$$1
B
$$\alpha$$1$$l$$1 = $$\alpha$$2l2
C
$$\alpha$$1$$l$$2 = $$\alpha$$2$$l$$1
D
$$\alpha$$1$$l$$22 = $$\alpha$$2$$l$$12
2
NEET 2016 Phase 1
+4
-1
Two non-mixing liquids of densities $$\rho$$ and n$$\rho$$ (n > 1) are put in a container. The height of each liquid is h. A solid cylinder of length L and density d is put in this container. The cylinder floats with its axis vertical and length $$\rho$$L ($$\rho$$ < 1) in the denser liquid. The density d is equal to
A
$$\left\{ {2 + \left( {n - 1} \right)p} \right\}\rho$$
B
$$\left\{ {1 + \left( {n - 1} \right)p} \right\}\rho$$
C
$$\left\{ {1 + \left( {n + 1} \right)p} \right\}\rho$$
D
$$\left\{ {2 + \left( {n + 1} \right)p} \right\}\rho$$
3
NEET 2016 Phase 1
+4
-1
A black body is at a temperature of 5760 K. The energy of radiation emitted by the body at wavelength 250 nm is U1, at wavelength 500 nm is U2 and that at 1000 nm is U3. Wien's constant, b = 2.88 $$\times$$ 106 nm K. Which of the following is correct ?
A
U1 > U2
B
U2 > U1
C
U1 = 0
D
U3 = 0
4
AIPMT 2015
+4
-1
Water rises to a height h in capillary tube. If the length of capillary tube above the surface of water is made less than h, then
A
water rises upto a point a little below the top and stays there.
B
water does not rise at all.
C
water rises upto the tip of capillary tube and then starts overflowing like a fountain.
D
water rises upto the top of capillary tube and stays there without overflowing.
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