## Explore Our Questions

### An aeroplane when 900 m high passes vertically above anot...

• A

381 m

• B

169 m

• C

254 m

• D

211 m

Posted by: Arun S. 1 day ago

### A vertical pole fixed to the ground is divided in the rat...

Posted by: Balaji.m 1 day ago

### From the foot and the top of a building of height 230 m, ...

Posted by: Remya.m.s 1 day ago

### A person, standing exactly midway between two towers, obs...

Posted by: Minhaj A. 1 day ago

### The angle of elevation of the top of the tower from a point on the ground is sin$^{-1}$($\frac{3}{5}$). If the point of observation is 20 meters away from the foot of the tower, what is the height of the tower?

• A

9 m

• B

18 m

• C

12 m

• D

15 m

Posted by: Aarti B. 1 day ago

Posted by: Harish S. 1 day ago

### Two persons are on either sides of a tower of height 50 m...

Posted by: Manoj J. 1 day ago

### If A$_1$ is the area of the parabola y$_2$= 4ax lying between vertex and the latus rectum and A$_2$ is the area between the latus rectum and the double ordinate x = 2a, then A$_1$ / A$_2$ is equal to.

• A

(2 $\sqrt{}$2 -1)

• B

$\frac{1}{7}$(2 $\sqrt{}$2 + 1)

• C

$\frac{1}{7}$(2 $\sqrt{}$2 -1)

• D

None of these

Posted by: Abhay 1 day ago

### A closed organ pipe of length L and an open organ pipe contain gases of densities ρ$_1$and ρ$_2$ respectively. The compressibility of gases is equal in both the pipes. Both the pipes are vibrating in their first overtone with the same frequency. Please help me to find the length of the open organ pipe.

Posted by: Souvik B. 1 day ago

### A body of mass m0 is placed on a smooth horizontal surfac...

• A

ue$^{\lambda t}$

• B

uλt

• C

ue$^-{\lambda t}$

• D

u(1-e $^-{\lambda}$$^t$)

Posted by: Amit M. 1 day ago

### A uniform chain of length L and mass M is lying on a smoo...

• A

MgL

• B

MgL/3

• C

MgL/9

• D

MgL/18

Posted by: Gaurav M. 1 day ago

### A hydrogen electrode X was placed in a buffer solution of sodium acetate and acetic acid in the ratio a:b and another hydrogen electrode Y was placed in a buffer solution of sodium acetate and acetic acid in the ratio b:a. If reduction potential values for two cells are found to be E$_1$ and E$_2$respectively w.r.t. standard hydrogen electrode, what would be the pKa values of the acid? Please explain the answer in brief.

Posted by: Sanjeev J. 1 day ago

### An LRC circuit consists of R = 25Ω and the reactanc...

Posted by: Satish K. 1 day ago

### An open pipe of sufficient length is dipping in water wit...

• A

cv/2l$^2$

• B

cv/4l$^2$

• C

c/2v$^2$ l $^2$

• D

c/4v$^2$ l $^2$

Posted by: Augustine A. 1 day ago

### he elevation of the summit of a mountain from its foot is...

Posted by: Parth S. 1 day ago

### The coefficient of friction between block of mass m and 2...

Posted by: Saurabh P. 1 day ago

### A magnet of moment M is lying in a magnetic field or induction B. W$_1$ is the work done in turning it from 0 to 60 degree &W$_2$ is the work done in turning it from 30$^0$ to 90$^0$ . Then

• A

W$_2$=W$_1$

• B

W$_2$=W$_1$/2

• C

W$_2$= 2W$_1$

• D

W$_2$=  $\sqrt{3}$ W$_1$

Posted by: Deepak M. 1 day ago

### Two coherent sources of different intensities send waves ...

• A

25:1

• B

5:1

• C

9:4

• D

625:2

Posted by: Gorishankar S. 1 day ago

### The relative density of a metal may be found by hanging a...

• A

(5.00 ± 0.05)

• B

5.00 ± 11%

• C

(500 ± 0.10)

• D

5.00 ± 6%

Posted by: Naveen P. 1 day ago

### The equation of a line through the point of intersection of the lines x – 3y + 1 = 0 and 2x + 5y – 9 = 0 and whose distance from the straight is $\sqrt{5}$ is .

• A

2x + y – 5 = 0

• B

2x – y + 5 = 0

• C

2x + y – 10 = 0

• D

2x – y – 10 = 0

Posted by: Ghanendra K. 1 day ago

### To a man standing outside his house, the angles of elevat...

• A

8.65 m

• B

2 m

• C

2.5 m

• D

3.65 m

Posted by: Raghavendra.k 1 day ago

### Please help me to find the equation of the circles which pass through the ends of the common chords of two circles 2x$^2$+ 2y$^2$ + 8x + 4y – 7 = 0 and x$^2$ + y$^2$– 8x – 4y – 5 = 0 and touch the line x = 7.

• A

x $^2$ +y$^2$ +120x-60y+11=0

• B

x $^2$ +y$^2$ -120x-60y+11=0

• C

x $^2$ +y$^2$ +120x+60y+11=0

• D

x $^2$ +y$^2$ +120x-60y-11=0

Posted by: Dishakaur 1 day ago

### A five-digit numbers divisible by 3 is to be formed using...

• A

216

• B

240

• C

600

• D

3125

Posted by: Sandeep S. 1 day ago

### The plane ax + by = 0 is rotated through an angle α...

• A

ax + by ± z √(a$^2$ +b$^2$ ) tan α = 0

• B

(ax + by) √(a$^2$ +b$^2$ ) ± z tan α = 0

• C

(ax + by) tan α ± z √(a$^2$ +b$^2$ ) = 0

• D

ax + by ± √(a$^2$ +b$^2$ ) z = tan α

Posted by: Hari O. 1 day ago

### A flagstaff stands in the centre of a rectangular field whose diagonal is 1200m and subtends angles 15$^0$ and 45$^0$ at the midpoints of the sides of the field. What would be the height of the Flagstaff? Please help me to find the correct answer.

• A

200m

• B

300√(2+√3)m

• C

300√(2-√3) m

• D

400m

Posted by: Hemanth S. 1 day ago

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