Guys many of you had said that you missed the questions because I posted them late in the night. So I have thought of posting them in the afternoon or evening. Will it be fine?
Done with uploading all chaps of 11th Organic and Inorganic. Will now start with 12th. I repeat, there is NO NEED to read PHYSICAL chemistry NCERT.
In members of phylum Annelida the neural system consist of ______ ganglia connected by _____ nerves to the ______ nerve cord.
Anonymous Quiz
6%
Unpaired, Medial, Dorsal
22%
Unpaired, Lateral, Ventral
16%
Paired, Medial, Dorsal
56%
Paired, Lateral, Ventral
The above organism is a member of phylum _______ and is _______.
Anonymous Quiz
28%
Annelida, Monoecious
60%
Annelida, Dioecious
9%
Arthropoda, Monoecious
4%
Arthropoda, Dioecious
The method used to produce Diborane on industrial scale is,
Anonymous Quiz
19%
4BF3 + 3 LiAlH4 → 2B2H6 + 3LiF + 3AlF3
21%
2NaBH4 +I2 →B2H6 +2NaI+H2
25%
2BF3 +6NaH ⎯⎯⎯→B2H6 +6NaF
35%
All of these
The main industrial application of borax is,
Anonymous Quiz
27%
Bullet proof vest
10%
Control rods
51%
Pyrex glasses
11%
Medicinal soaps
The two sides of a step ladder BA and CA are 1.6 m long and hinged at A. A rope DE, 0.5 m is tied half way up. A weight 40 kg is suspended from a point F, 1.2 m from B along the ladder BA. Assuming the floor to be frictionless and neglecting the weight of the ladder, find the tension in the rope(approx).(Take g = 9.8 m/s2)
Take a bicycle rim and extend its axle on both sides. Tie two strings at both ends A and B, as shown in the adjoining figure. Hold both the strings together in
one hand such that the rim is vertical.Now keeping the rim in vertical position with both the strings in one hand, put the wheel in fast rotation around the axle with the other hand.
one hand such that the rim is vertical.Now keeping the rim in vertical position with both the strings in one hand, put the wheel in fast rotation around the axle with the other hand.
Then leave one string, say B, from your hand,then
Anonymous Quiz
16%
The rim tilts and keeps rotating
10%
The rim tilts and stops
69%
The rim keeps rotating in a vertical plane and the plane of rotation turns around the held string A
5%
The rim shows an abnormal trajectory