Time: 16min

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1. +2
2. +1
3. +3
4. +4
If the coordinates of vertices of ΔOAB are (0,0), (cosα,sinα) and (−sinα,cosα) respectively, then OA²+OB²=
1. 0
2. 3
3. 2
4. 1
The minimum distance between the real object and its real image for concave mirror is
1. Zero
2. 2f
3. 4f
4. f
If one end of a diameter of the circle x²+y²−4x−6y+11=0 be (3, 4), then the other end is :
1. (1,1)
2. (2,1)
3. (1,2)
4. (0,0)
If an ammeter is to be used in place of a voltmeter, then we must connect with the ammeter a
1. low resistance in parallel
2. high resistance in parallel
3. high resistance in series
4. low resistance in series
If the momentum of a body increases by 0.01%, its kinetic energy will increase by
1. 0.04%
2. 0.01%
3. 0.02%
4. 0.08%
Which of the following represents the formula of a compound which contains 20% nitrogen and 80% oxygen ?
1. NO₂
2. NO
3. N₂O₅
4. N₂0₃
1 g of a steam at 100°C melt how much ice at 0°C? (Latent heat of ice = 80 cal/gm and latent heat of steam = 540 cal/gm
1. 2 gm
2. 4 gm
3. 1 gm
4. 8 gm
d/dx log₁₀(x+2)²=
1. 1/(x+2)²
2. 2/(x+2)
3. 2/ ln10 (x+2)
4. 2ln10/(x+2)
The block of mass M moving on the frictionless horizontal surface collides with the spring of spring constant K and compresses it by length L. The maximum momentum of the block after collision is
1. ML²/K
2. √MKL
3. Zero
4. KL²/2M

IOE EXAM